I understand voltage is pressure and amps is current but how does different voltage work or more efficient for some items?
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Electrical devices consume power measured in watts. Watts can be simplified as volts times amps. Wire has a voltage rating based on the insulation and an amperage rating based mostly on its diameter. I have a wall oven rated at 3100 watts. At 120 volts the oven draws 25.8 amps; at 240 volts it draw 12.9 amps and consequently can be wired safely with a smaller diameter wire which is cheaper to buy and easier to install.
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