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383b - —.¢— The answer is(g The basis of thehC...

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Unformatted text preview: —.¢— The answer is (g) The basis of thehC generator is Faraday's Law, which describes how emf is induced by a changing magnetic field. The induced emf on a circuit is directly proportional to the time rate of change of the magnetic flux through the circuit. For an AC generator of the type depicted, the rate of change of magnetic flux will be di‘ rectly proportional to loop area, number of turns in the loop, eatemal magnetic field strength, and angular velocity. Doubling the number of turns in the loop and increasing angular velocity both increase emf. Changing the resistance in the circuit will not change the induced emf. The question, however, asks about changes to the torque of the crank. it gen- erator transforms mechanical to electrical energy. Power output of mechanical rotation is the product of torque and angular yeiocity, P: 1m. Eiy conservation of energy, crank power equals the power output at the resistor. Although the emf doesn't change by only changing the resistance. with the same emf, quarter-log the resistance means a fourfold increase in power output {11- ”=1 11:11] requiring four- fold greater torque to maintain the same angular 1urelocity. R 11'II‘5 BASIC aIIIESIEIH FDR .le AC GEHEMTDR I5 EhIPtD'I'ED TD GENERATE MUST CIF THE ELECTRICAL PU‘I'I'ER CDHSUMED IN MODERN SDCIET‘I', llIl'il'ITH to - Infill-Ia] IN THE UNITED STATES. © Em .J WHEEL ...
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