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Understanding Electrical Technology Concepts

Total questions: 36

Worksheet time: 18mins

Name
Class
Date
1.

What is the SI unit of electric current?

a)

Volt

b)

Ampere

c)

Ohm

d)

Watt

2.

Which material is commonly used as a conductor in household wiring?

a)

Copper

b)

Rubber

c)

Glass

d)

Wood

3.

What is the formula for Ohm’s Law?

a)

<katex latex="V = I \times R"></katex>

b)

<katex latex="P = V \times I"></katex>

c)

<katex latex="R = \frac{V}{P}"></katex>

d)

<katex latex="I = V + R"></katex>

4.

Which device is used to measure electric current?

a)

Voltmeter

b)

Ammeter

c)

Ohmmeter

d)

Thermometer

5.

What is the typical voltage of a standard UK mains electricity supply?

a)

110 V

b)

230 V

c)

400 V

d)

12 V

6.

Which of the following is an insulator?

a)

Aluminium

b)

Silver

c)

Plastic

d)

Iron

7.

What does AC stand for in electrical technology?

a)

Alternating Current

b)

Active Circuit

c)

Average Current

d)

Amplified Charge

8.

Which component stores electrical energy in an electric field?

a)

Resistor

b)

Capacitor

c)

Inductor

d)

Diode

9.

What is the resistance of a 10 metre copper wire if its resistivity is 1.7×10−8 Ω⋅m1.7 \times 10^{-8} \ \Omega \cdot m , cross-sectional area is 2×10−6 m22 \times 10^{-6} \ m^2 ?

a)

0.085 Ω0.085 \ \Omega

b)

0.00085 Ω0.00085 \ \Omega

c)

0.85 Ω0.85 \ \Omega

d)

8.5 Ω8.5 \ \Omega

10.

Which of the following is NOT a renewable source of energy?

a)

Solar

b)

Wind

c)

Coal

d)

Hydroelectric

11.

What is the function of a fuse in an electrical circuit?

a)

To increase current

b)

To protect against overcurrent

c)

To store energy

d)

To convert AC to DC

12.

Which law states that the total current entering a junction equals the total current leaving the junction?

a)

Ohm’s Law

b)

Faraday’s Law

c)

Kirchhoff’s Current Law

d)

Lenz’s Law

13.

What is the power dissipated by a resistor of carrying a current of ?

a)

10 W

b)

20 W

c)

5 W

d)

2.5 W

14.

Which of the following is used to convert AC to DC?

a)

Transformer

b)

Rectifier

c)

Inductor

d)

Capacitor

15.

What is the frequency of the UK mains electricity supply?

a)

50 Hz

b)

60 Hz

c)

100 Hz

d)

25 Hz

16.

Which of the following is a unit of electrical energy?

a)

Watt

b)

Joule

c)

Ampere

d)

Ohm

17.

What is the colour of the earth wire in a standard UK three-pin plug?

a)

Brown

b)

Blue

c)

Green and yellow

d)

Red

18.

Which device is used to increase or decrease AC voltage?

a)

Transformer

b)

Rectifier

c)

Resistor

d)

Capacitor

19.

What is the main function of a diode?

a)

To store charge

b)

To allow current to flow in one direction only

c)

To increase resistance

d)

To measure voltage

20.

Which of the following is a safety device used in electrical circuits?

a)

Switch

b)

Fuse

c)

Resistor

d)

Capacitor

21.

What is the symbol for resistance?

a)

<katex latex="V"></katex>

b)

<katex latex="I"></katex>

c)

<katex latex="R"></katex>

d)

<katex latex="P"></katex>

22.

Which of the following is measured in ohms?

a)

Voltage

b)

Current

c)

Resistance

d)

Power

23.

What is the main function of a transformer?

a)

To store energy

b)

To change voltage levels

c)

To convert DC to AC

d)

To measure current

24.

Which of the following is a non-conductor of electricity?

a)

Silver

b)

Copper

c)

Glass

d)

Aluminium

25.

What is the unit of electric charge?

a)

Ampere

b)

Coulomb

c)

Watt

d)

Ohm

26.

Which of the following is used to measure potential difference?

a)

Ammeter

b)

Voltmeter

c)

Ohmmeter

d)

Thermometer

27.

What is the formula for electrical power?

a)

<katex latex="P = V \times I"></katex>

b)

<katex latex="P = I^2 \times R"></katex>

c)

<katex latex="P = \frac{V^2}{R}"></katex>

d)

All of the above

28.

Which of the following is a type of alternating current generator?

a)

Dynamo

b)

Alternator

c)

Battery

d)

Solar cell

29.

What is the main function of an inductor in a circuit?

a)

To oppose changes in current

b)

To store voltage

c)

To increase resistance

d)

To convert AC to DC

30.

Which of the following is the correct equation for calculating energy transferred in an electrical circuit?

a)

<katex latex="E = V \times I \times t"></katex>

b)

<katex latex="E = I^2 \times R \times t"></katex>

c)

<katex latex="E = \frac{V^2}{R} \times t"></katex>

d)

All of the above

31.

Which of the following materials is commonly used as an electrical insulator?

a)

Gold

b)

Iron

c)

Mercury

d)

Rubber

32.

What device is used to protect electrical appliances from excessive current?

a)

Transformer

b)

Fuse

c)

Capacitor

d)

Inductor

33.

Which instrument is used to measure electric current in a circuit?

a)

Wattmetre

b)

Ammeter

c)

Voltmeter

d)

Galvanometre

34.

Which component is used to store electrical energy in an electric field?

a)

Transformer

b)

Inductor

c)

Resistor

d)

Capacitor

35.

Which of the following devices is used to protect electrical appliances from short circuits?

a)

Switch

b)

Transformer

c)

Fuse

d)

Capacitor

36.

What is the main function of a resistor in an electrical circuit?

a)

To limit current flow

b)

To store charge

c)

To increase current

d)

To decrease resistance

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