Electric Circuit Symbols

Question 1

Answer 1

Cell

Question 2

Answer 2

Battery of cells

Question 3

Answer 3

Battery

Question 4

Answer 4

Power supply

Question 5

Describe a power supply

Answer 5

It is permanent, not temporary and is not a battery. It provides current by plugging something into it. It relies on an electricity source

Question 6

Answer 6

D.c power supply
Doesn’t run out and follows conventional current flow.

Question 7

Describe the flow of current from a d.c power source

Answer 7

Like a battery it only supplies direct current in 1 direction.
Conventional current flow

Question 8

Answer 8

A.c power supply

Question 9

Answer 9

Fixed resistor
Slows current down

Question 10

Name, ability and example

Answer 10

Variable resistor
Has the ability to change resistance such as a dimmer switch or hairdryer

Question 11

Name, purpose, example

Answer 11

Thermistor
Reacts to temperature
Can change resistance according to temperature
Eg. Infrared security camera that sees change in temperature

Question 12

Name, example, purpose

Answer 12

Light-dependent resistor/photo resistor
Light-controlled variable resistor. The darker it is the higher the resistance
The brighter it is the lower the resistance
NEEDS TO BE IN A CIRCUIT WITH A TRANSISTOR
Day/night switch
LDR

Question 13

Answer 13

Heater
(Won’t see in circuit)

Question 14

Answer 14

Potential divider

Question 15

Answer 15

Transformer

Question 16

Answer 16

Magnetising coil

Question 17

Answer 17

Parallel cells

Question 18

Answer 18

Switch

Question 19

Name and purpose

Answer 19

Earth/ground
Way to dissipate charge
(Bury it)

Question 20

Answer 20

Junction of conductors
Wires coming together

Question 21

Answer 21

Lamp
ALSO ACTS AS RESISTOR

Question 22

Answer 22

Lamp
ALSO ACTS AS RESISTOR

Question 23

Answer 23

Motor

Question 24

Answer 24

Generator

Question 25

Answer 25

Ammeter
ONLY CONNECTED IN SERIES

Question 26

Are ammeters connected in parallel or series and why

Answer 26

Series as they have a low resistance

Question 27

What does a voltmeter do and do we connect it in parallel or series

Answer 27

It measures the e.m.f in volts (how much energy we are supplying to the circuit)
Parallel as it has a very high resistance and it does not alter the flow of current

Question 28

Answer 28

Diode

Question 29

What does a diode do +Eg. In real life

Answer 29

It changes AC current to DC
Electronic devices like current going in 1 direction, so there is a diode in your laptop charger

Question 30

Name and purpose

Answer 30

LED
Light emitting diode
Changes AC current to DC current and emits light in the process (needs very little current)

Question 31

Name and purpose

Answer 31

Fuse
Protection device, trip switch/circuit breaker
Stops current that can cause circuit damage depending on the rating. The wire burns out to stop the connection

Question 32

Name and description

Answer 32

Relay coil

made of an electromagnet coil and a magnetic switch