Circuit Symbols

Question 1

Answer 1

diode

only allows current to pass through in one direction

Question 2

Answer 2

variable resistor

a resistor whose resistance can be varied, increasing the resistance decreases the current

Question 3

Answer 3

AC supply

alternating current, current flows one way, then the other

Question 4

Answer 4

push switch (open)

no current flows until push switch is pushed

has never been spotted in a paper

Question 5

Answer 5

milliammeter

(a sensitive ammeter, which measures in milliamps)

Question 6

Answer 6

relay​

an electromagnetic switch

has never been spotted in a paper​

Question 7

Answer 7

microphone

converts sound energy to electrical energy

has never been spotted in a paper​

Question 8

Answer 8

thermistor

resistance changes with temperature, cold = high resistance, can be used as a temperature sensor

Question 9

Answer 9

cell

converts chemical energy to electrical energy

Question 10

Answer 10

resistor

reduces the current flowing

Question 11

Answer 11

light emitting diode (LED)

a diode that emits light, only allows current to pass through in one direction

Question 12

Answer 12

push switch (closed)

switch is pushed, current can flow

has never been spotted in a paper​

Question 13

Answer 13

lamp

converts electrical energy to light (and heat too)

Question 14

Answer 14

electric bell

ding ding

has never been spotted in a paper​

Question 15

Answer 15

fuse

safety device, thin wire melts when current is too high, breaks circuit

Question 16

Answer 16

motor

converts electrical energy to kinetic energy

Question 17

Answer 17

closed switch

current can flow, circuit is complete

Question 18

Answer 18

battery

two or more cells connected

Question 19

Answer 19

transformer

can increase or decrease AC voltage/current

often labelled when seen in a paper

Question 20

Answer 20

heater

heats things, converts electrical energy to thermal energy

has never been spotted in a paper​

Question 21

Answer 21

light dependent resistor (LDR)

resistance changes with light intensity, dark = high resistance, can be used as a light sensor

Question 22

Answer 22

open switch​

current can’t flow, circuit is broken

Question 23

Answer 23

generator

converts kinetic energy to electrical energy

has never been spotted in a paper

Question 24

Answer 24

ammeter

measures current, placed in series

Question 25

Answer 25

DC supply

direct current, current flows from positive to negative

Question 26

Answer 26

voltmeter​

measures voltage, placed in parallel across the component to be measured

Question 27

Answer 27

Earth

safety feature, allows charge to flow away safely

has never been spotted in a paper