P2 Circuit Symbols

Question 1

Name the component

Answer 1

Ammeter

Always connected in series - has very low resistance

Question 2

Name the component

Answer 2

Battery

more than on cell joined together

Question 3

Name the component

Answer 3

Cell

Question 4

Name the component

Answer 4

Closed switch

Question 5

Name the component

Answer 5

Diode

Only allows current to flow one way - it has infinite resistance in the reverse direction

Question 6

Name the component

Answer 6

Filament lamp (bulb)

Filament wire gets hot, its resiatnce increases and it glows

Question 7

Name the component

Answer 7

Fuse

If the current is too high the fuse wire melts or blows breaking the circuit

Question 8

Name the component

Answer 8

LDR

(Light Dependent Resistor)

As light intensity (brightness) increases the resistance decreases

Question 9

Name the component

Answer 9

LED

(Light Emitting Diode)

Same as a normal diode except it gives out light e.g. the stand-by light on a tv

Question 10

Name the component

Answer 10

Open Switch

Question 11

Name the component

Answer 11

Resistor

Question 12

Name the component

Answer 12

Thermistor

Temperature Dependent Resistor - as temperature increases the resistance decreases

Question 13

Name the component

Answer 13

Voltmeter

Always connected in parallel - has a very high resistance

Question 14

Name the component

Answer 14

Variable resistor

Controls the size of the current in a circuit - dimmer switch, volume control