﻿ SmartLearner ## Electrodynamics

(This section must be read in conjunction with the CAPS, p. 130–131.)

### Electrical machines (generators, motors)

• State the energy conversion in generators.
• Use the principle of electromagnetic induction to explain how a generator works.
• Explain the functions of the components of an AC and a DC generator.
• State examples of the uses of AC and DC generators.
• State the energy conversion in motors.
• Use the motor effect to explain how a motor works.
• Explain the functions of the components of a motor.
• State examples of the use of motors.

### Alternating current

• State the advantages of alternating current over direct current.
• Sketch graphs of voltage versus time and current versus time for an AC circuit.
• Define the term rms for an alternating voltage or an alternating current. The rms value of AC is the DC potential difference/current which dissipates the same amount of energy as AC.
• Solve problems using: • Solve problems using: ,
(for a purely resistive circuit), and 