Question 1

What is the correct name for the electrical device shown?

Accepted Answer

a filament bulb

Answer

an LED bulb

Answer

a glass bulb

Answer

a fluorescent bulb

Question 2

Why is the filament glowing?

Accepted Answer

the wire filament is heated by an electrical current

Answer

the vapour in the bulb is glowing

Answer

there is a chemical reaction

Answer

the filament is burning

Question 3

Which of the following statements about filament bulbs is incorrect?

Accepted Answer

they are very energy efficient

Answer

they require an electrical current

Answer

they use a thin wire coil

Answer

they get very hot

Question 4

Which of the following statements are correct?

Question 5

Which of the following components is represented by the circuit symbol shown?

Accepted Answer

variable resistor

Answer

fuse

Answer

thermistor

Answer

heater

Answer

resistor

Question 6

Which of the following equations shows the correct relationship between potential difference, V, current, I and resistance, R?

Accepted Answer

R = V ÷ I

Answer

R = I ÷ V

Answer

R = I × V

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