Which will save the cost of electricity: 125 or 225?

Question

If I ran one device rated at 125 volts 100 watts from a 125 volt power supply, and another device rated at 225 volts 100 watts (same wattage) from a 225 voltage power supply and the both voltage power supplies has the same diameter wires (type of conductors), which device would waist more electricity, making the electric bill more expensive?

Answer 1

It's an interesting question, let's analyze it.

Both loads consume the same power 100 W for example a light bulb resistive load.

Both power supplies have the same kind of conductors, if we assume that the conductors on each supply will have the same characteristics, for example length and wire gauge then they will have the same resistance to the load. Just to make some numbers think it's 1 Ohm.

If you use the 125 V power supply the current on the circuit will be 0.8 A. And the the power dissipated in the conductors would be
P = 0.8^2*1 = 0.64 W so the total power would be 100.64 W.

If you use the 225 V power supply the current on the circuit will be 0.4 A. And the the power dissipated in the conductors would be
P = 0.4^2*1 = 0.16 W so the total power would be 100.16 W.

As you can see it would be cheaper to run the load using the 225 V power supply.

In general if you use a higher voltage source, then the copper losses (the power dissipated in the conductors) will be less. That's why electric companies use high voltage to transmit electrical energy.

Answer 2

If there both 2 wire systems they will be the same
100Watts is 100 Watts
The only thing that will change is the current will be less in the 225 Volt system.
Formula used P=I*E
P= Power in watts
I= Current in Amps
E= Voltage in Volts
But again the total power of each is 100Watts and the electric company measures in Watts used and charges that way.

Answer 3

If both devices consume exactly 100 watts of energy, then their will be no difference in energy use. In practice however, there is an energy saving when using higher voltage systems, particularly in large power consumption systems. For example the motor in your household vacuum cleaner runs on 110 VAC, but the motor is very small.

In industrial applications it is not uncommon to have motors that run on voltages over 10,000 volts. For example big gas compressors might have motors rated in thousands of horsepower. In this application it is better to use high voltage motors because the energy demand for these high voltage applications would require extremely large currents to drive the load. The large current demand would generate more heat and heat generation is one form of wasted energy.

Answer 4

Neither. the two use precisely a similar volume of electricity as a results of fact that they are the two a hundred watt instruments. as a results of fact that watts = volts x amps, the 225 volt gadget will use fewer amps, however the electrical powered businesses do no longer care what number amps you employ, they only care what number watt hours you employ. it somewhat is using the fact amps on my own do no longer degree capability. Now watts are no longer a level of capability the two, they seem to be a level of capability. capability is the linked fee of using capability. in case you employ a hundred watts for one hour, you have used a hundred watt hours of capability. the actual unit of capability is Joules. One watt is one Joule in line with 2d. For some reason the electrical powered businesses do no longer desire to invoice you for Joules, they constantly invoice in kilowatt hours. bypass determine!

Answer 5

i believe it is 225 b/c P=IV. increase V, lower I, constant P

if 125, it is low V, high I, constant P

NOTE: "I" is the measurement of the flow electricity. less I save electricity.

Answer 6

both r the same,it is matter of safety