Grade 9 Physics – Electric Current, Potential
Difference and Resistance
Question Bank with Answers
ONE MARK QUESTIONS
1. What is electric current?
Answer: The rate of flow of electric charge is called electric current.
2. Write the SI unit of current.
Answer: Ampere (A)
3. What is electric charge?
Answer: Electric charge is the property of matter responsible for electric
effects.
4. Name the instrument used to measure current.
Answer: Ammeter
5. What is potential difference?
Answer: Work done in moving unit positive charge from one point to
another.
6. Write the SI unit of potential difference.
Answer: Volt (V)
7. Name the instrument used to measure potential difference.
Answer: Voltmeter
8. What is resistance?
Answer: Opposition offered to the flow of electric current.
9. Write the SI unit of resistance.
Answer: Ohm
, 10. State Ohm’s law.
Answer: At constant temperature, current is directly proportional to
potential difference.
11. Write Ohm’s law equation.
Answer: V = IR
12. What is a conductor?
Answer: A substance that allows electric current to pass through it.
13. What is an insulator?
Answer: A substance that does not allow electric current to pass through it.
14. What is a closed circuit?
Answer: A circuit in which current flows continuously.
15. What is an open circuit?
Answer: A circuit in which current does not flow.
16. Name the device used to control current in a circuit.
Answer: Rheostat
17. What is the direction of conventional current?
Answer: From positive terminal to negative terminal.
18. What is meant by electron flow?
Answer: Movement of electrons through a conductor.
19. What is a cell?
Answer: A device that converts chemical energy into electrical energy.
20. Name one source of direct current.
Answer: Battery
Difference and Resistance
Question Bank with Answers
ONE MARK QUESTIONS
1. What is electric current?
Answer: The rate of flow of electric charge is called electric current.
2. Write the SI unit of current.
Answer: Ampere (A)
3. What is electric charge?
Answer: Electric charge is the property of matter responsible for electric
effects.
4. Name the instrument used to measure current.
Answer: Ammeter
5. What is potential difference?
Answer: Work done in moving unit positive charge from one point to
another.
6. Write the SI unit of potential difference.
Answer: Volt (V)
7. Name the instrument used to measure potential difference.
Answer: Voltmeter
8. What is resistance?
Answer: Opposition offered to the flow of electric current.
9. Write the SI unit of resistance.
Answer: Ohm
, 10. State Ohm’s law.
Answer: At constant temperature, current is directly proportional to
potential difference.
11. Write Ohm’s law equation.
Answer: V = IR
12. What is a conductor?
Answer: A substance that allows electric current to pass through it.
13. What is an insulator?
Answer: A substance that does not allow electric current to pass through it.
14. What is a closed circuit?
Answer: A circuit in which current flows continuously.
15. What is an open circuit?
Answer: A circuit in which current does not flow.
16. Name the device used to control current in a circuit.
Answer: Rheostat
17. What is the direction of conventional current?
Answer: From positive terminal to negative terminal.
18. What is meant by electron flow?
Answer: Movement of electrons through a conductor.
19. What is a cell?
Answer: A device that converts chemical energy into electrical energy.
20. Name one source of direct current.
Answer: Battery
