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An ampere is a measure of current. A watt is a measure of power. It's kind of like asking how many feet are in a pound. Current can be calculated from power. You need to know an associated voltage or an associated resistance then you can use these fundamental relationships: Voltage = Current * Resisitance (V = I * R) and Power = Current * Voltage (P = I * V). Manipulating these two gives another useful relationship: P = I^2 * R. So there are two ways to relate Power and Current; 1) through Resistance and 2) through Voltage. In this situation, if you know the Resistance then Current equals square root (5 watts/R). If you know the Voltage then the Current equals 5 watts/V.

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16y ago

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