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Ca HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18

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Free Shipping CAD$38.18 HP 19v 4.74a Laptop Ac Adapter For Notebook, Computer, LCD / LED Monitor, TV, Bluetooth Wireless Speaker, Ventilator, Ultrabook, ToughBook, Gaming PC, Tablet, Serve...,Genuine Or Replacement HP 19v 4.74a Ac Adapter Is In Stock And 1 Year Warranty

Image Output Volt Current Max Power Tip Size Tip Note Price Adapter Code
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-5.5x2.5mm 19V 4.74A 90W 5.5 x 2.5mm CAD$ 38.18HP19V4.74A90W-5.5x2.5mm
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-4.8x1.7mm 19V 4.74A 90W 4.8 x 1.7mm CAD$ 33.98HP19V4.74A90W-4.8x1.7mm
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-7.4x5.0mm 19V 4.74A 90W 7.4 x 5.0mm CAD$ 45.18HP19V4.74A90W-7.4x5.0mm
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-BULLETTIP 19V 4.74A 90W BULLETTIP CAD$ 42.98HP19V4.74A90W-BULLETTIP
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-7.4x5.0mm-Slim 19V 4.74A 90W 7.4*5.0mm Slim Coming soon!HP19V4.74A90W-7.4x5.0mm-Slim
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL 19V 4.74A 90W 5.5 x 2.5mm RIGHT-ANGE CAD$ 40.23HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL
Original / Genuine HP 19v 4.74a AC Adapter --- HP19V4.74A90W-4.5x2.8mm 19V 4.74A 90W 4.5x2.8mm CAD$ 43.17HP19V4.74A90W-4.5x2.8mm

Buy Ca HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18 in Canada Toronto, CALGARY, Montreal, Ottawa, Edmonton, MISSISSAUGA, Vancouver, Winnipeg, Laval, QUEBEC, London, Victoria, Markham, Brampton, Oakville, Gatineau, Richmond, Hill, Surrey, Scarborough, Kitchener, Burlington, Hamilton, Saskatoon, North York, Waterloo, Windsor, Milton, Burnaby, Oshawa, Richmond, Guelph, Regina, North Vancouver, Thornhill, Sherbrooke, Kingston, Coquitlam, Halifax, Etobicoke, WHITBY, CAMBRIDGE, Kelowna, Kanata, Barrie, Nanaimo...

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-5.5x2.5mmCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-5.5x2.5mm 1 Year Warranty Quality inspection ok

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Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-5.5x2.5mm

Adapter Code:HP19V4.74A90W-5.5x2.5mm
Model:HP 19v 4.74a
Ac InPut: 100-240V~1.5A(1.5A) 50-60HZ
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 270g
Size( L x W x H ): 128x50x31mm
Original: Yes
Tip Size: 5.5 x 2.5mm
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 48.33
  • Christmas Price:
    CAD$ 38.18
    ( Update: Mar 2024 )
  • You save: CAD$ 10.15
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-5.5x2.5mm. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-5.5x2.5mm
This adapter can replace / compatiable follow adapter model:

Fit Laptop (Machine) Model:
WESTINGHOUSE LD-3285VX, WESTINGHOUSE LD-4255VX, [ WESTINGHOUSE ac adapter ], WESTINGHOUSE LCD TV.

detail

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-4.8x1.7mmCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-4.8x1.7mm 1 Year Warranty Quality inspection ok

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Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-4.8x1.7mm

Adapter Code:HP19V4.74A90W-4.8x1.7mm
Model:HP 19v 4.74a
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 270g
Size( L x W x H ): 128 x 50 x 31mm
Original: Yes
Tip Size: 4.8 x 1.7mm
Adapter Note: Compatible 4.8x1.7mm yellow tip and 4.8x1.7mm metal tip.
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 43.01
  • Christmas Price:
    CAD$ 33.98
    ( Update: Mar 2024 )
  • You save: CAD$ 9.03
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-4.8x1.7mm. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-4.8x1.7mm
Fit Laptop (Machine) Model:
PAVILION DV1000, PAVILION DV1010, PAVILION DV1100, PAVILION DV1130 SERIE, PAVILION DV2000, [ PAVILION DV2100 ac adapter ], PAVILION DV2200, PAVILION DV2300, PAVILION DV2400, PAVILION DV2500, PAVILION DV2600, PAVILION DV2700 SERIES, PAVILION DV6000, [ PAVILION DV6100 ac adapter ], PAVILION DV6200, PAVILION DV6300, PAVILION DV6400, PAVILION DV6500, PAVILION DV6600, PAVILION DV6700 SERIES, PAVILION DV8000, [ PAVILION DV8100 ac adapter ], PAVILION DV8200, PAVILION DV8300, PAVILION DV8400 SERIES, PAVILION DV9000, PAVILION DV9100, PAVILION DV9200, PAVILION DV9300, [ PAVILION DV9400 ac adapter ], PAVILION DV9500, PAVILION DV9600, PAVILION DV9700 SERIES, PRESARIO X1000, PRESARIO X1200, PRESARIO X1300, PRESARIO X1400, [ PRESARIO X1500 SERIES ac adapter ], PRESARIO M2000 SERIES, PRESARIO V2000, PRESARIO V2100, PRESARIO V2200, PRESARIO V2300, PRESARIO V2400, PRESARIO V2500, [ PRESARIO V2600 ac adapter ], PRESARIO V3000, PRESARIO V4000, PRESARIO V5000, PRESARIO V6000 SERIES, EVO N100 SERIES, EVO N110, EVO N150, [ EVO N200 SERIES ac adapter ], EVO N200, EVO N400 SERIES, EVO N400C, EVO N410C, EVO N600 SERIES, EVO N600, EVO N600C, [ EVO N610 ac adapter ], EVO N610C, EVO N620C, EVO N800 SERIES, EVO N800, EVO N800C, EVO N800V, EVO N800W, [ EVO N1000 SERIES ac adapter ], EVO N1000, EVO N1000C, EVO N1000V, EVO N1005V, EVO N1015, EVO N1015V, EVO EVO N1020, [ EVO N1020V ac adapter ], EVO N1050, EVO N1050V.

detail

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-7.4x5.0mmCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-7.4x5.0mm 1 Year Warranty Quality inspection ok

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Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-7.4x5.0mm

Adapter Code:HP19V4.74A90W-7.4x5.0mm
Model:HP 19v 4.74a
Ac InPut: 100-240V~2.4A(2,4A)50-60Hz
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 329g
Size( L x W x H ): 126.30 x 50.10 x 30.00mm
Original: Yes
Tip Size: 7.4 x 5.0mm
Adapter Note: BIG Tip With a pin inside
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 57.19
  • Christmas Price:
    CAD$ 45.18
    ( Update: Mar 2024 )
  • You save: CAD$ 12.01
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-7.4x5.0mm. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-7.4x5.0mm
Fit Laptop (Machine) Model:
Compaq 2510p, PAVILION DV2-1000, PAVILION DV3500, PAVILION DV3600, PAVILION DV3-2000, PAVILION DV4-1200, [ PAVILION DV5-1000 ac adapter ], PAVILION DV5-1100, PAVILION DV5-1200, PAVILION DV6-1000, PAVILION DV6-1100, PAVILION DV7-1000, PAVILION DV7-1100, PAVILION DV7-1200, [ PAVILION DV7-2000 ac adapter ], HP PAVILION G3200 DESKTOP PC SERIES, PRESARIO CQ50-100 NOTEBOOK SERIES, PRESARIO CQ60-100 NOTEBOOK SERIES, PRESARIO CQ60-200 NOTEBOOK SERIES, PRESARIO CQ60-300 NOTEBOOK SERIES, PRESARIO CQ61-100 NOTEBOOK SERIES, PRESARIO CQ70-100 NOTEBOOK SERIES, [ PRESARIO CQ70-200 NOTEBOOK SERIES ac adapter ], PRESARIO CQ71-100 NOTEBOOK SERIES, G60-100 NOTEBOOK SERIES, G60-200 NOTEBOOK SERIES, G70-100 NOTEBOOK SRIES, G70-200 NOTEBOOK SERIES, HDX X16-1000 PREMIUM NOTEBOOK SERIES, HDX X16-1100 PREMIUM NOTEBOOK SERIES, [ HDX X16-1200 PREMIUM NOTEBOOK SERIES ac adapter ], COMPAQ 2510P NOTEBOOK PC, COMPAQ 2710P NOTEBOOK PC, COMPAQ 6510B NOTEBOOK PC, COMPAQ 6530B NOTEBOOK PC, COMPAQ 6710B NOTEBOOK PC, COMPAQ 6715B NOTEBOOK PC, COMPAQ 6715S NOTEBOOK PC, [ COMPAQ 6730B NOTEBOOK PC ac adapter ], COMPAQ 6735B NOTEBOOK PC, COMPAQ 6735S NOTEBOOK PC, COMPAQ 6910P NOTEBOOK PC, COMPAQ 8510P NOTEBOOK PC, COMPAQ 8510W MOBILE WORKSTATION, COMPAQ 8710P NOTEBOOK PC, COMPAQ 8710W MOBILE WORKSTATION, [ COMPAQ NC4400 NOTEBOOK PC ac adapter ], COMPAQ NC6400 NOTEBOOK PC, ELITEBOOK 6930P NOTEBOOK PC, ELITEBOOK 8530P NOTEBOOK PC, PROBOOK 4510S NOTEBOOK PC, PROBOOK 4515S NOTEBOOK PC, PROBOOK 4710S NOTEBOOK PC, 6710BB, 519330-002, 463955-001, 6910P, ELITEBOOK 8560W, ENVY 14, PROBOOK 4310S, PPP012D-S, [ PAVILION DV5 ac adapter ], [ PROBOOK 4525S ac adapter ], PROBOOK 4535S, PROBOOK 4540S, PROBOOK 4720S, PROBOOK 5310M, PROBOOK 5320M, COMPAQ 6715S, COMPAQ 6735S, COMPAQ 6715B, COMPAQ 6710B, COMPAQ NC8430, ENVY 15, ELITEBOOK 8470P, ELITEBOOK 8470W, ELITEBOOK 8570P, PAVILION 14-E019TX, PAVILION 14-E020TX, PAVILION 14-E021TX.

detail

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-BULLETTIPCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-BULLETTIP 1 Year Warranty Quality inspection ok

Ask a Question  Ask a Question       Share with friends  Share This Item
Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-BULLETTIP

Adapter Code:HP19V4.74A90W-BULLETTIP
Model:HP 19v 4.74a
Ac InPut: 100-240V~2.4A(2,4A)50-60Hz
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 320g
Size( L x W x H ): 126.30 x 50.10 x 30.00mm
Original: Yes
Tip Note: BULLETTIP
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 54.41
  • Christmas Price:
    CAD$ 42.98
    ( Update: Mar 2024 )
  • You save: CAD$ 11.43
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-BULLETTIP. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-BULLETTIP

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-7.4x5.0mm-SlimCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-7.4x5.0mm-Slim 1 Year Warranty Quality inspection ok

Ask a Question  Ask a Question       Share with friends  Share This Item
Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-7.4x5.0mm-Slim

Adapter Code:HP19V4.74A90W-7.4x5.0mm-Slim
Model:HP 19v 4.74a
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 303g
Original: Yes
Tip Size: 7.4*5.0mm
Tip Note: Slim
Coming soon!
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-7.4x5.0mm-Slim
Fit Laptop (Machine) Model:
519330-002, 463955-001, 6910P, PROBOOK 4310S, PPP012D-S, PAVILION G6, PAVILION DV3, PAVILION DV4, [ PAVILION DV5 ac adapter ], PAVILION G4, PAVILION G7, [ PAVILION TM2 ac adapter ].

detail

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGELCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL 1 Year Warranty Quality inspection ok

Ask a Question  Ask a Question       Share with friends  Share This Item
Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL

Adapter Code:HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL
Model:HP 19v 4.74a
Ac InPut: 100-240V~2.4A(2,4A)50-60Hz
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 320g
Size( L x W x H ): 126.30 x 50.10 x 30.00mm
Original: Yes
Tip Size: 5.5 x 2.5mm
Tip Note: RIGHT-ANGE
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 50.92
  • Christmas Price:
    CAD$ 40.23
    ( Update: Mar 2024 )
  • You save: CAD$ 10.69
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-5.5x2.5mm-RIGHT-ANGEL
This adapter can replace / compatiable follow adapter model:

Fit Laptop (Machine) Model:
[ Compaq 2510p ac adapter ], COMPAQ 6530B, 519330-002, 463955-001, WESTINGHOUSE LD-3285VX, WESTINGHOUSE LD-4255VX, WESTINGHOUSE LCD TV.

detail

This item will be shipped by Canada Post( Canada Post Default )

HP 19V 4.74A  Notebook ac adapter, HP19V4.74A90W-4.5x2.8mmCa HP 19v 4.74a AC/DC Adapter, Power Supply CAD$38.18, 19V, 4.74A , HP19V4.74A90W-4.5x2.8mm 1 Year Warranty Quality inspection ok

Ask a Question  Ask a Question       Share with friends  Share This Item
Package Include: 1 AC adapter + 1 CA Power Cord ( Default ) Free Shipping In CA

Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-4.5x2.8mm

Adapter Code:HP19V4.74A90W-4.5x2.8mm
Model:HP 19v 4.74a
Ac InPut: 100-240V~50-60Hz 1.6A(1,6A)
DC Out Put: 19V
Out Put Current: 4.74A
Max Power: 90W
Adapter Weight: 348g
Size( L x W x H ): 141.10 x 54.90 x 31.30mm
Original: Yes
Tip Size: 4.5x2.8mm
Quantity2-45-910-1920-4950+
Discount5%8%10%12%15%
  • In Stock
  • Original Price: CAD$ 54.65
  • Christmas Price:
    CAD$ 43.17
    ( Update: Mar 2024 )
  • You save: CAD$ 11.48
  • Please make sure that the adapter's interface specifications are correct when purchasing.

Machine Model:*
Qty:


( Canada HP 19V 4.74A AC/DC adapter HP19V4.74A90W-4.5x2.8mm. 3-11 days free shipping in Canada. )
Zahlung Canada HP 19V 4.74A  AC/DC adapter HP19V4.74A90W-4.5x2.8mm
This adapter can replace / compatiable follow adapter model:

Fit Laptop (Machine) Model:
PAVILION G6.

detail

Free shipping CAD$38.18 HP 19v 4.74a laptop ac adapter for notebook, computer, LCD / LED monitor, TV, bluetooth wireless speaker, ventilator, Ultrabook, ToughBook, gaming PC, tablet, serve...,Genuine or replacement HP 19v 4.74a ac adapter is in stock and 1 year warranty

Tags: HP 19v 4.74a AC Adapter, CA HP 19v 4.74a ac adapter, HP 19v 4.74a Laptop adapter, HP adapter

Question Related HP 19v 4.74a laptop ac Adapter ( From internet ):

When a computer power supply says voltage range 100-240, does it actually mean that it supports any voltage between 100v ~ 240v or does it mean either 120V or 240V? I only have 208V outlets available?

Yes, 100–240V means any voltage input within this range is acceptable. In most cases, it would not matter whether it is 50 Hz or 60 Hz supply.

Internally the computer power supply (called SMPS) converts incoming AC into DC supply. This DC voltage is then switched at high frequency, passed through a step down transformer and rectified again to produce 3.3V, 5V, 12V and other similar voltages.

The switcher needs only sufficient DC voltage and that is available in this AC range. Some low cost low- power wall adapters even work for “Universal range” i.e. 90V to 270V AC.

Why does Europe have a voltage of 220V, Japan has 100V, and North America has 110V? Is 220V better, more dangerous, or more efficient? Why doesn't the world converge into a more unified voltage?

Back in the early 20th century Edison experimented extensively to find the ‘sweet spot’ voltage for incandescent lamps. That is, most lumen’s vs filament life. He settled on 110 volts as the best compromise given the state of the art on filament design. 60 cycle AC was determined by Tesla as an appropriate speed for induction motors. Also, in 1890 it was decided that arc lights operated better using 60 cycles instead of lower frequencies. In the early 1970’s the electrical industry in the US raised the voltage to 120/240 volts, from 110/220 volts in the US. This was perhaps to accommodate expanding consumer use of electricity.

Higher voltages allow smaller wire sizes for the same power (watts) since watts is equal to volts times amps, one can double the voltage as in Europe, and draw half the amperage to get the same power. This allows smaller wire sizes.

The heating of wires is due to the numbers of factors, such as:

  1. The type of wire, such as copper or aluminum.
  2. The size of the wire, such as no. 12 or no. 14.
  3. The number of amperes flowing through the wire.
  4. The insulation covering the wire.
  5. Airflow around the wire.
  6. Ambient temperature.

Counter-intuitively the larger wire size is no. 12 rather than 14 in this example. No. 10 is larger then no. 12.

Higher voltages do not directly cause heating, higher amperage's do, with everything else being equal.

Therefore, by using higher voltages, one can reduce the wire size for the same amount of power (watts) being transmitted.

Another example is when transmitting large amounts of power over long distances as the power companies do, the voltages are extremely high, as in hundreds of thousands of volts which allows the power companies to use smaller cables. Since heat losses in conductors is mostly dependant on AMPERAGE, higher voltages reduce line losses. There are other factors, to consider, such as corona (ionization of the air) losses when using extremely high voltages. The air actually starts conducting electricity.

Europe, having watched electrical development in the US doubled the 110/220 volts to 220/240 to reduce wire size and thus wiring costs. Europe having observed the pros and cons of 60 cycles and 110/240 V current decided that 50 cycles and 220 V volts was more cost-effective than the US system. They also selected 50 cycles vs 60 cycles because generating 50 cycles current allowed slower prime mover speeds, such as diesel engine speeds, turbine speeds etc which would reduce wear on the machinery.

From a usage standpoint, there is little difference between 50 cycles vs 60 cycles. Six of one a half dozen of the other. However, lower frequencies require slightly more transformer iron so slightly heavier transformer sizes were required which apparently was offset by reduce wiring costs. Also, smaller wire sizes lower installation costs as smaller wire is easier to install.

Another factor when transmitting power over long distances as in the power grid, is that higher frequencies cause larger line losses due to increased effects of inductance and capacitance. At higher frequencies, there is the skin affect to consider. At 50 to 60 cycles skin affect has little effect on conductors.

Once one gets up to radio frequencies in the kilocycles range, skin affect begins to matter. Skin effect is due to Eddy currents in the cable which are caused by alternating current inductance, ‘pushing’ current flow toward the surface of the conductor, which effectively reduces the cross-sectional area of the conductor, which increases resistance.

Commercial airplanes use 400 cycles because the savings in weight on planes is important and smaller on board transformers and electrical equipment save weight. The size of transformers is inversely proportional to the frequency used. Therefore, higher frequency systems can use smaller, lighter transformers.

And, as others have said, once the infrastructure is in place configured for specific voltages and frequencies, the costs of changing from one standard to another is unnecessary and cost prohibitive.

240 volts is riskier to work with than 120 volts, because for a given resistance, such as the resistance of a human body, the amperage passing through ones body will be higher. The body is sensitive to current (amps) passing through it, especially across the heart. A sustained current of about 30 to 50 milliamps will kill most people, due to electrical interference of the hearts rhythm. People ask which is more dangerous AC or DC? AC interferes with the hearts rhythm and can causes the heart to go into ventricular fibrillation which if not immediately treated will cause death. High voltage warning signs imply that high voltage is what kills. Actually, amperage kills but voltage pushes the amps, so the high-voltage warnings really mean that the voltage is high enough to push enough amps to kill you. It doesn’t take much amperage across the chest to cause death 10 mA is often enough.

DC tends to cause muscles to seize onto the conductor so the victim cannot let go. The heating effects due to the resistance of the body is a large factor in DC shocks.

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