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- 1. Multiple Choice
Which of the following is a form of electromagnetic induction?
producing electric current by moving a magnet through a wire loop
using an electromagnet to measure electric current
producing mechanical energy by sending electric current through an electromagnet
changing electrical energy to mechanical energy that produces sound
- 2. Multiple Choice
Which of the following devices produces electric current?
generator
stereo speaker
galvanometer
electric motor
- 3. Multiple Choice
Which of the following best describes how electricity is generated for homes?
The spinning of a windmill's blades creates electric current without a generator.
Nuclear reactions produce an electric current inside the reaction chamber.
Steam pushes turbine blades in a generator, which changes the mechanical energy into electrical energy.
Water released from a dam generates electric current, which is transformed into mechanical energy.
- 4. Multiple Choice
Which of the following devices can increase or decrease the voltage of an alternating current?
generator
transformer
battery
galvanometer
- 5. Multiple Choice
Why do power plants commonly produce alternating current?
It is less hazardous to use than direct current.
Less resistance is created in the wire.
Direct current requires the use of transformers.
The voltage of alternating current can be increased or decreased with a transformer.
- 6. Multiple Choice
The generation of a current by a changing magnetic field is called _____________.
magnetism
electromagnetic induction
an electromagnet
direct current
- 7. Multiple Choice
A device that uses electromagnetic induction to transform mechanical energy into electrical energy is a _________________.
electromagnet
magnet
generator
motor
- 8. Match
Match the following
electric current that always flows in one direction
Direct Current
flow of electric charge
Alternating Current
electric current that reverses direction periodically
Current
- 9. Multiple Choice
A _______________ is a device that increases or decreases the voltage of an alternating current.
turbine
generator
transformer
motor
- 10. Match
Match the following
Step Up Transformer
Step Down Transformer
Motor
Generator
- 11. Multiple Choice
If you have a transformer with more coils on the primary coil than on the secondary coil, then ___________________.
Its output voltage will be more than the input voltage.
Its input voltage will be more than the output voltage.
Its input and output voltage will be unchanged.
Its impossible to know how the voltage will be affected.
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