Is it less expensive to operate an electric heating unit with higher voltage and lower amps or?

Is it less expensive to operate an electric heating unit with higher voltage and lower amps or?

Is it less expensive to operate an electric heating unit with higher voltage and lower amps or?

lower voltage and higher amps. The heating unit has to have the same amount of heating power. I need this for an electricity class and cannot find the answer anywhere in my text book. If you can tell me why also, itd be helpful since I would like to know the answer for personal knowledge. Thanks in advance.

In simple theory it should be exactly the same cost
to operate the two units.

Electricity is billed by the kilowatt hour and
a kilowatt hour is 1,000 watts used over a period
of one hour.

If you use a heating unit that uses 110 volts at
10 amps it dissipated 1100 watts and it it is run
for an hour, it burns 1.1 kilowatt hour.

If you use a heating unit that uses 220 volts at
5 amps, it will still dissipate 1100 watts and
burn 1.1 kilowatt hour so the cost is nearly exactly
the same.

If you are at the beginning of your electricity class, the costs
are EXACTLY the same.

If you are further along, you may find that is a little less expensive to utilize
higher voltage and lower amps because the voltage drop over the heater will
be higher in comparison with the voltage drop over the electric lines supplying the
voltage, or else we have to compensate for this at lower voltages by using thicker
lower resistance wiring.

For your purposes, I believe your answers are costs are exactly the same.

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