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6. In a GENERATOR the brushes connect the spinning slip rings to
- the magnetic field where the coil spins inside it
- the external circuit
- the coil
7. Generators induce a current by
- spinning a magnet inside a coil of wire
- Either
- spinning a coil of wire inside a magnetic field
8. Electrical power =
- Current * resistance
- Voltage * current
- Voltage / current
9. Which of these is NOT a way to increase the induced voltage in a GENERATOR?
- having more turns and an iron core in the coil
- increase the current through the wires
- turning the magnet/coil faster
- using a magnet with a stronger magnetic field
10. How do we find the direction of movement, magnetic field and current in a generator?
- Use the RIGHT hand grip
- Use Fleming's RIGHT hand rule
- Use Fleming's LEFT hand rule
11. A voltage is produced when
- a magnet moves in a coil of wire
- a magnet touches a coil of wire
- a soft iron bar moves in a coil of wire
12. A bicycle dynamo is an example of
- a generator
- a motor
- a magnet
13. Is mains electricity AC or DC?
- AC
- DC
- depends on the type of generator it was produced in
14. Because the induced current switches direction every half turn in a GENERATOR, what type of current is produced?
- Alternating current
- Direct current
- both
15. Why do the national grid use transformers to REDUCE THE CURRENT?
- When a large current flows through a wire it reduces the speed of transfer of electricity
- When a large current flows through a wire lots of energy is lost as heat
- Large currents cost a lot of money to create