Physics Test 2 (Electromagnetic Induction)

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Physics Test 2 (Electromagnetic Induction)
2010-10-10 23:36:06
Electromagnetic Induction

Physics Test 2
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  1. Power is transmitted at high voltages because the corresponding current in the wires is...
    low so that overheating of the wires is minimized.
  2. Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?
    440 W
  3. Neon signs require 12000 volts to operate. If the circuit uses a 120-volt power source, the ratio of primary to secondary turns on the transformer should be...
  4. The principal advantage of AC power over DC power is that...
    AC voltage can be transformed via conventional transformers.
  5. A certain transformer doubles input voltage. If the primary coil has 10 A of current, the the current in the secondary coil is...
    5 A.
  6. A step-up transformer increases...
    neither power or energy.
  7. The output power of an ideal transformer is...
    equal to the input power.
  8. Transformers use AC so there will be the required...
    change in magnetic field for operation.
  9. A transformer actually transforms...
  10. If the voltage produced by a generator alternates, it does so because...
    the changing magnetic field that produces it alternates.
  11. A device that transforms electrical energy to mechanical energy is a...
  12. If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops,
    twice as much voltage is induced.
  13. Electromagnetic induction occurs in a coil when there is a change in...
    magnetic field intensity in the coil.
  14. Thrust a magnet into a coil of wire and the coil...
    becomes an electromagnet and has a current in it.