Circuit symbols

Question 1

Battery

Answer 1

Provides the power for the circuit in the form of a voltage. The circuit won’t work without it.

Question 2

Switch

Answer 2

Allows the circuit to be switched on or off by blocking the current.

Question 3

Resistor

Answer 3

Controls the size of the current flowing through the circuit.

Question 4

Variable resistor

Answer 4

Allows the user to vary the current flowing through a circuit.

Question 5

LDR

Answer 5

Varies the circuit current depending on how much light is shining on it.

Question 6

Thermistor

Answer 6

Varies the current depending on how hot or cold it is.

Question 7

LED

Answer 7

Light emitting diodes produce light but uses a small amount of power.

Question 8

Motor

Answer 8

This produces a rotary motion when you pass a current through it.

Question 9

What is the purpose of a transistor

Answer 9

Acts as a switch

Question 10

What is the top part of a transistor?

Answer 10

The collector

Question 11

What is the middle part of a transistor?

Answer 11

The base

Question 12

What is the bottom part of a transistor?

Answer 12

The emitter