21.2. Electric Generators http://www.ck12.org
- Which of the two generators in the video involves a wire-wrapped armature?
- What is the difference between the DC generator and the AC generator?
Review
Questions
- What three things are necessary to produceEMFmechanically?
(a) magnet, force lines, and magnetic field
(b)EMF, conductor, and magnetic field
(c) conducting wire, magnetic field, and relative motion
(d) conducting wire, electrical field, and relative motion
(e) none of these will produceEMFmechanically - Increasing which of the following will increase the output of a generator?
(a)EMF
(b) strength of the magnetic field
(c) resistance of the conductor
(d) load on the meter
(e) none of these - The current in the rotating coil of all generators is
(a) AC
(b) DC
(c) pulsating AC
(d) pulsating DC - A generator in a power plant develops a maximum voltage of 170. V.
(a) What is the effective voltage?
(b) A 60.0 W light bulb is placed across the generator. A maximum current of 0.70 A flows through the
bulb. What effective current flows through the bulb?
(c) What is the resistance of the light bulb when it is working? - The effective voltage of a particular AC household outlet is 117 V.
(a) What is the maximum voltage across a lamp connected to the outlet?
(b) The effective current through the lamp is 5.50 A. What is the maximum current in the lamp?
- direct current:An electric current flowing in one direction only.
- alternating current:An electric current that reverses direction in a circuit at regular intervals.
- electric generator:An electric generator is a device that converts mechanical energy to electrical energy.
- armature:The rotating part of a generator, consisting essentially of copper wire wound around an iron core.