P4 Electric Circuits

Question 1

Cell (battery)

Answer 1

A cell ‘pushes’ the electrons around a complete circuit.

Question 2

Switch

Answer 2

A switch enables you to break and complete a circuit, so turn on and off.

Question 3

Bulb (Indicator)

Answer 3

Emits light when current flows through it.

Question 4

Fixed Resistor

Answer 4

A fixed resistor limits the current in a circuit.

Question 5

Variable Resistor

Answer 5

A variable resistor allows the current in a circuit to be varied.

Question 6

Thermistor

Answer 6

A thermistor allows the current depending on the temperature

Question 7

Fuse

Answer 7

A fuse is designed to melt and break the circuit if the current is too great.

Question 8

Diode

Answer 8

A diode allows current through in only one direction

Question 9

Light-Emitting Diode (LED)

Answer 9

A light-emitting diode (LED) emits light when current passes through it

Question 10

Light-Dependent Resistor (LDR)

Answer 10

A light-dependent resistor (LDR) decreases in resistance as light intensity increases

Question 11

Ammeter

Answer 11

A ammeter is used to measure electric current (Amps)

Question 12

Voltmeter

Answer 12

A voltmeter is used to measure electric potential difference (voltage).