P3: Circuit Symbols

Question 1

Answer 1

Electromagnet

Coil of wire with magnetic field

Question 2

Answer 2

Reed Switch

Switch controlled by a magnetic field

Question 3

Answer 3

Ammeter

Measures current in Amps

Question 4

Answer 4

Light Dependent Resistor (LDR)

Resistance decreases when light is shone on it.

Question 5

Answer 5

Light Emitting Diode (LED)

Lights up when a current is passed through IN THE RIGHT DIRECTION

Question 6

Answer 6

Diode

Only lets current flow in one direction

Question 7

Answer 7

Variable Resistor

Gives control over the resistance/ current e.g. a light dimmer switch

Question 8

Answer 8

Resistor

Reduces current (by increasing resistance)

Question 9

Answer 9

SPST (SIngle Pole Single Throw) switch

Simple on-off switch/ makes and breaks the circuit

Question 10

Answer 10

Buzzer

Turns electrical energy into sound

Question 11

Answer 11

Motor

Turns electrical energy into kinetic energy (movement)

Question 12

Answer 12

Lamp

Turns electrical energy into light energy

Question 13

Answer 13

Fuse

Breaks the circuit if current is too high i.e. if there is a fault

Question 14

Answer 14

Battery

Made up of several cells

Question 15

Answer 15

Cell

Converts chemical energy to electrical energy in a circuit