1 (Credit). A magnet is moved into a coil of wire.
Which of the following changes would not increase the size of the voltage induced in the coil?
a. Having more turns of wire on the coil.
b. Moving the magnet faster into the coil.
c. Using a stronger magnet.
d. Using thicker wire for the coil.
2. In a bicycle dynamo
a. a coil of wire turns inside another coil of wire.
b. a coil of wire turns inside a magnet.
c. a magnet turns inside a coil of wire.
d. a magnet turns inside another magnet.
3. A transformer consists of
a. one coil of wire wound on a permanent magnet.
b. one coil of wire wound on a metal core.
c. two coils of wire wound on a permanent magnet.
d. two coils of wire wound on a metal core.
4. A transformer has 4600 turns on its primary winding and 2200 turns on its secondary winding. The primary is connected to the 230 volt mains.
Calculate the voltage obtained from the secondary.
5 (Credit). A transformer is 80 % efficient.
Calculate the output power in watts from this transformer when the input power is 2500 W.
6. Complete the passage by choosing the correct entry from the list. Type in the letter corresponding to each of your answers. You will need to use one letter twice.
