The current in a circuit is supplied by a generator. If the...

The current in a circuit is supplied by a generator. If the resistance in the circuit is increased, the force required to keep the generator turning at the same speed is
(A) decreased
(B) increased
(C) the same

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Key Concepts

Electromagnetic Induction

This principle explains how a generator converts mechanical energy into electrical energy by moving a conductor within a magnetic field, which induces an electromotive force (voltage) in the conductor. The induced current interacts with the magnetic field to produce forces that oppose the motion, a phenomenon closely linked to Lenz's law.

Ohm's Law and Circuit Behavior

Ohm’s law states that current in a circuit is equal to the voltage divided by the resistance. In the context of a generator connected to a resistive load, increasing the resistance reduces the current. Since the magnitude of electromagnetic braking (which opposes the generator’s motion) depends on the current, a higher resistance leads to lower current and thus a reduced electromagnetic opposing force.

Electromechanical Energy Conversion

This concept involves transforming mechanical energy into electrical energy within devices such as generators. The conversion process inherently produces a counteractive electromagnetic force that the prime mover must overcome. Changes in circuit parameters, like resistance, influence the magnitude of this force by altering the current produced during the energy conversion.

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