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If a loop of wire is moved into a magnetic field, a voltage appears across the ends of the loop. The physical principle is electromagnetic induction.

If a resistor is then connected across the ends, current will flow, heating up the resistor. This time, a force will be needed to push the loop into the magnetic field. This force supplies the energy that goes to heat the resistor, and the principle here is Conservation of Energy.

An engineer's job is to make this process reliable and efficient.

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