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
Faradays Law states that “the emf produced is directly proportional to the rate of change of flux”.
In simpler terms, faster movement of the wires creates more current in the wire.