Electricity

Question 1

What are the three main concepts in electricity and what are there units?

Answer 1

• Current (amps)
• Voltage (volts)
• Resistance (Oms)

Question 2

Define Voltage

Answer 2

It’s what makes the current flow

Question 3

Define Current

Answer 3

The rate of flow of charge

Question 4

Define resistance

Answer 4

It’s what trys to prevent the current from flowing

Question 5

In a uk plug, there are three types of wires, what are they called and what colours are they?

Answer 5

• Earth wire: Green and yellow
• Neutral wire: Blue
• Live wire: Brown

Question 6

What is a fuse?

Answer 6

It protects the electrical circuit from damage due to excess current.

Question 7

What does insulation do?

Answer 7

Insulation protects the user from being electrocuted

Question 8

What does double insulation do and what does it not require?

Answer 8

Things that are double insulated require no earthing wire as it is enterly surrounded by insulation.

Question 9

What do devices keep your house safe?

Answer 9

• Fuses in plugs
• Circuit breaker

Question 10

What does a circuit breaker do?

Answer 10

Protects electrical circuit from damage due to excess current and can be reset

Question 11

What are the two equations for power?

Answer 11

• P=IV
• P=E/t