P4.2.4 - Generators

Question 1

What is an alternating potential difference?

Answer 1

A potential difference that changes direction

Question 2

How is an alternating potential difference formed?

Answer 2

By using an axis of rotation to change the direction of the current

Question 3

What is an alternator?

Answer 3

An AC generator

Question 4

Describe how an alternator works.

Answer 4

A coil of wire spins between the poles of a magnet. Brushes brush against the slip rings so that the voltmeter is always connected to the ends of the coil and the coil does not become tangled

Question 5

What is a dynamo?

Answer 5

A DC generator

Question 6

What is different between the potential difference made from AC and DC generators?

Answer 6

In alternators, the potential difference switches directions

Question 7

Why can the potential difference not change direction in a dynamo?

Answer 7

It is connected to a split ring commutator

Question 8

How can you increase output in alternators and dynamos?

Answer 8

Use stronger magnetic fields
Use more turns on the coil
Spin the coil faster