P2: Electricity

Question 1

What is current?

Answer 1

The flow of electrical charge.

Question 2

What is current measured in?

Answer 2

Amps (A)

Question 3

What does voltage do?

Answer 3

Pushes the charge round the circuit.

Question 4

What does resistance depend on?

Answer 4

Whether in series of parallel

Length of wire

Question 5

Where must the ammeter be placed?

Answer 5

Series

Question 6

Where must the voltmeter be placed?

Answer 6

Parallel

Question 7

What is a sensing circuit?

Answer 7

It turns on or increases power to components depending on conditions.

Question 8

Series circuits?
PD
Current
Resistance

Answer 8

PD adds up
Current is the same everywhere
Resistance adds up
The more cells, the higher the PD

Question 9

Parallel?
PD
Current
Resistor

Answer 9

PD is the same across components.
Current is shared
Adding resistor reduces total resistance.

Question 10

What is AC?

Answer 10

Alternating current

Question 11

What is the voltage of the UK supply?

Answer 11

230v

Question 12

What are wired made out of in a plug?

Answer 12

Copper

Question 13

What does the neutral wire do? What colour is it?

Answer 13

Blue, carried away current at 0v

Question 14

What does the live wire do? +colour?

Answer 14

Brown, provides 230v current flows in.

Question 15

What does the earth wire do?

Answer 15

For safety eg. an electrical surge, extra current flows down.