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What are volts and amperes? Volts and amperes are measures of electricity. A volt is the unit of electric potential difference, or the size of the force that sends the electrons through a circuit. An ampere is the unit used to measure electric current. Current is a count of the number of electrons flowing through a circuit.
Volts is a measure of the electromotive force or electrical pressure that you battery is capable of producing. The more volts you have (pressure) the more work you can do with it. To test this out, take a standard motor (say, a Speed 400) and attach a 7.2V battery to it and note the sound it makes.his means that the power consumption of this 300 WATT motor is 290 WATTS which is close to its limit. But the power output is somewhat lower than this figure. Let us take another case: An UNGER running on 7 cells with a 9 x 6 prop fitted draws 20.7 AMPS Therefore 7 VOLTS x 20.7 AMPS = 144.9 WATTS power consumption.