Electromagnetism - Circuit Breaker - Motor
Quiz - gcsescience.com.

1. A magnetic field is produced

a) When two sticks are rubbed together

b) When two rocks are banged together

c) When current flows through a wire

d) When no current flows through a wire

 

2. Two ways of increasing the strength of
      a magnetic field around a coil are

a) Use more turns of wire and a bigger current

b) Use more turns of wire and a smaller current

c) Use red wire and an iron core

d) Use red wire and an apple core

 

3. A circuit breaker

a) Hits part of the circuit when there is too much resistance

b) Disconnects the circuit when there is too much resistance

c) Disconnects the supply when there is too much current

d) Disconnects the supply when there is too little current

 

4. RCCB stands for

a) Royal College Circuit Breaker

b) Royal Circuit Current Breaker

c) Residual College Circuit Breaker

d) Residual Current Circuit Breaker

 

5. An electric motor

a) Transfers charge into current

b) Transfers electrical energy into kinetic energy

c) Converts voltage into current

d) Converts voltage into resistance

 

6. A split - ring commutator

a) Divides the commutator to make it last longer

b) Reverses the direction of the current every half turn

c) Reverses the direction of the current every turn

d) Splits one motor into two

 

7. A split - ring commutator is needed

a) To keep a DC motor turning in the same direction

b) Only for large motors

c) Only for generators

d) Where a motor might spin too quickly and wear out

 

                       
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