150 QUESTIONS AND ANSWERS
1. What is the unit of electrical resistance?
o Answer: Ohm (Ω)
2. What is the function of a fuse in an electrical circuit?
o Answer: To protect the circuit from overcurrent
3. Which of the following is a conductor of electricity?
o Answer: Copper
4. What is the formula for electrical power?
o Answer: P = V × I
5. What does AC stand for in electrical terms?
o Answer: Alternating Current
6. What is the purpose of an earth wire in an electrical system?
o Answer: To prevent electric shocks
7. Which device is used to measure electric current?
o Answer: Ammeter
8. What is the symbol for a resistor in a circuit diagram?
o Answer: A zigzag line
9. What is the frequency of the mains electricity supply in most
countries?
o Answer: 50 Hz
, 10.What is the function of a capacitor in a circuit?
• Answer: To store electrical energy
11.What is the SI unit of electric charge?
• Answer: Coulomb (C)
12.What is the main purpose of a transformer?
• Answer: To increase or decrease voltage
13.What is the relationship between voltage, current, and resistance?
• Answer: V = I × R (Ohm’s Law)
14.What is the function of a diode in an electrical circuit?
• Answer: To allow current to flow in one direction only
15.What is the typical voltage of a household electrical supply in Kenya?
• Answer: 240 V
16.What is the primary function of an electric motor?
• Answer: To convert electrical energy into mechanical energy
17.What is the unit of electrical power?
• Answer: Watt (W)
18.What is the purpose of a circuit breaker?
• Answer: To protect the circuit from overload
19.What is the formula for calculating electrical energy?
• Answer: \E = P \\times t \
20.What is the function of an insulator in an electrical system?
• Answer: To prevent the flow of electricity
21.What is the typical color of a live wire in electrical systems?
• Answer: Red
22.What is the purpose of a relay in an electrical circuit?
• Answer: To control a circuit using a low-power signal
23.What is the unit of capacitance?
1. What is the unit of electrical resistance?
o Answer: Ohm (Ω)
2. What is the function of a fuse in an electrical circuit?
o Answer: To protect the circuit from overcurrent
3. Which of the following is a conductor of electricity?
o Answer: Copper
4. What is the formula for electrical power?
o Answer: P = V × I
5. What does AC stand for in electrical terms?
o Answer: Alternating Current
6. What is the purpose of an earth wire in an electrical system?
o Answer: To prevent electric shocks
7. Which device is used to measure electric current?
o Answer: Ammeter
8. What is the symbol for a resistor in a circuit diagram?
o Answer: A zigzag line
9. What is the frequency of the mains electricity supply in most
countries?
o Answer: 50 Hz
, 10.What is the function of a capacitor in a circuit?
• Answer: To store electrical energy
11.What is the SI unit of electric charge?
• Answer: Coulomb (C)
12.What is the main purpose of a transformer?
• Answer: To increase or decrease voltage
13.What is the relationship between voltage, current, and resistance?
• Answer: V = I × R (Ohm’s Law)
14.What is the function of a diode in an electrical circuit?
• Answer: To allow current to flow in one direction only
15.What is the typical voltage of a household electrical supply in Kenya?
• Answer: 240 V
16.What is the primary function of an electric motor?
• Answer: To convert electrical energy into mechanical energy
17.What is the unit of electrical power?
• Answer: Watt (W)
18.What is the purpose of a circuit breaker?
• Answer: To protect the circuit from overload
19.What is the formula for calculating electrical energy?
• Answer: \E = P \\times t \
20.What is the function of an insulator in an electrical system?
• Answer: To prevent the flow of electricity
21.What is the typical color of a live wire in electrical systems?
• Answer: Red
22.What is the purpose of a relay in an electrical circuit?
• Answer: To control a circuit using a low-power signal
23.What is the unit of capacitance?
