The generator effect (triple only)

Question 1

Define the term potential difference

Answer 1

Energy transferred per unit charge (when current flows around a circuit)

Question 2

Describe two ways in which potential difference can be induced in a conductor

Answer 2

Conductor moving relative to a magnetic field, Magnetic field around the conductor changing

Question 3

Describe the generator effect

Answer 3

The movement of a conductor in a magnetic field causes a potential difference to be induced which causes a current to flow, also known as electromagnetic induction

Question 4

Describe how the direction of an induced p.d. or current can be reversed

Answer 4

Reverse the movement of the conductor or the magnet, Reverse the polarity of the magnet

Question 5

State the factors that affect the size of the induced p.d. or current in a conductor

Answer 5

Speed of the movement, Strength of the magnetic field, the number of turns in the coil

Question 6

Describe how a microphone uses the generator effect to make an electrical signal from sound waves

Answer 6

Sound wave -> oscillating air particles -> Coil moves back and forth in magnetic field -> Causes p.d. to be induced -> causes current

Question 7

What type of current is involved with both microphones and loudspeakers?

Answer 7

AC