P4.2 Current and charge

Question 1

What is a battery?

Answer 1

Consists of 2 cells or more

Question 2

What is a switch?

Answer 2

Enables the current in a circuit to be switched on or off

Question 3

What is a bulb?

Answer 3

An indicator that emits light as a signal when current is passed through it

Question 4

What is a diode?

Answer 4

Allows current through in one direction only

Question 5

What is an LED?

Answer 5

Emits light when a current passes through it

Question 6

What is an ammeter?

Answer 6

Used to measure currents in Amperes

Question 7

What is a resistor?

Answer 7

Limits the current in a ciruit

Question 8

What is a fuse?

Answer 8

Designed to melt and therefore ‘break’ the circuit if the current through it is greater than a certain amount

Question 9

What is a heater?

Answer 9

Designed to transfer the energy from an electric current to the surroundings

Question 10

What is a voltmeter?

Answer 10

Used to measure potential difference

Question 11

What is an electric current?

Answer 11

The flow of charge

Question 12

What is charge measured in?

Answer 12

Coulombs

Question 13

What is current measured in?

Answer 13

Amperes

Question 14

What is the equation for current in a wire?

Answer 14

Charge flow, Q / time taken

Question 15

How do electrons move in a circuit diagram?

Answer 15

• to + however when drawing circuit diagrams the convention is to show current flowing from + to -