12.2+ALTERNATING+CURRENT

IB PHYSICS > 12 Electromagnetic Induction
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ALTERNATING CURRENT
Describe the emf induced in a coil rotating within a uniform magnetic field. Students should understand, without any derivation, that the induced emf is sinusoidal if the rotation is at constant speed.

Explain the operation of a basic alternating current (ac) generator.

Describe the effect on the induced emf of changing the generator frequency.

Students will be expected to compare the output from generators operating at different frequencies by sketching appropriate graphs.

AC generator applets demonstrate effect of changing frequency. FENDT AC GENERATOR FSU AC GENERATOR

Discuss what is meant by the root mean squared (rms) value of an alternating current or voltage. Students should know that the rms value of an alternating current (or voltage) is that value of the direct current (or voltage) that dissipates power in a resistor at the same rate. The rms value is also known as the rating.

State the relation between peak and rms values for sinusoidal currents and voltages Solve problems using peak and rms values.

Solve ac circuit problems for ohmic resistors. Describe the operation of an ideal transformer Solve problems on the operation of ideal transformers. AC generator applets: FENDT AC GENERATOR FSU AC GENERATOR