Typical form 3 exam questions on electricity?

1. Define the term 'electric current' and explain how it is measured.

2. Describe the difference between series and parallel circuits. Provide examples of each.

3. What is the relationship between voltage, current, and resistance in an electrical circuit? Explain using Ohm's Law.

4. How does a circuit breaker work to protect against electrical overloads?

5. Explain the concept of electrical power and how it is calculated in a circuit.

6. Describe the function of a resistor in an electrical circuit and how it affects the flow of current.

7. What is the purpose of an electrical insulator and give examples of common insulating materials.

8. Discuss the dangers of electric shock and how to prevent it in a home or workplace.

9. Explain the role of a transformer in changing the voltage of an electrical circuit.

10. Describe the process of generating electricity in a power plant and how it is distributed to homes and businesses.

Multiple Choice Questions

- Which of the following is the SI unit of electric current?
(a) Ampere
(b) Ohm
(c) Coulomb
(d) Volt

- Ohm's law states that the current through a conductor is directly proportional to:
(a) The voltage applied
(b) The resistance of the conductor
(c) The temperature of the conductor
(d) The area of the conductor

- A resistor with a resistance of 10 Ω has a potential difference of 5 V applied across it. What is the current through the resistor?
(a) 0.5 A
(b) 1.0 A
(c) 2.0 A
(d) 5.0 A

- Which of the following is the symbol for power?
(a) V
(b) I
(c) R
(d) P

- A circuit with a total resistance of 10 Ω has a battery with an emf of 20 V. What is the current in the circuit?
(a) 1 A
(b) 2 A
(c) 3 A
(d) 4 A

Short Answer Questions

- Explain the difference between a series circuit and a parallel circuit.
- Describe the relationship between voltage, current, and resistance according to Ohm's law.
- What is the potential difference between two points in an electric circuit?
- How does increasing the temperature of a conductor affect its resistance?
- Calculate the power dissipated by a 100 Ω resistor carrying a current of 2 A.

Extended Response Questions

- Describe the principle of operation of a simple electric motor.
- Explain how a transformer works to change the voltage of an alternating current (AC) signal.
- Discuss the factors that affect the resistance of a conductor.
- Design a circuit that includes a battery, a resistor, and a switch, and explain how it works.
- Analyze a circuit diagram and determine the current through each component.