Electrical circuits and symbols

Question 1

Switch

Answer 1

used to turn a circuit on (closed) and off (open)

Question 2

Lamp

Answer 2

an electrical current heats the filament in a bulb so that it gives out light

Question 3

Fixed resistor

Answer 3

a resistor restricts or limits the flow of electrical current , a fixed resistor has a resistance that does not change

Question 4

Variable resistor

Answer 4

moving the position of the slider on this resistor changes the resistance

Question 5

Thermistor

Answer 5

the resistance of a thermistor depends on its temperature. at low temps the resistance is high and at high temps the resistance is low

Question 6

Light dependant resistor (LDR)

Answer 6

resistance of an LDR depends on light intensity at low levels LDR resistance is high and at low levels of light LDR resistance is low

Question 7

Semi conductor diode

Answer 7

allows current to flow in one direction only, used to convert an alternating current into a direct current