The unit of electric charge is the coulomb and two like charges always repel, so this IGCSE Year 9 sheet starts from the charge that current carries. Q = I × t is recorded as the charge relation, with ampere confirmed as the unit of current.
Key Takeaways
The unit of electric charge is the coulomb (Q1).
Two like electric charges always repel each other (Q2).
Q5 records Q = I × t as the charge equation.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.What is the unit of electric charge?
(a) coulomb(b) ampere(c) volt(d) ohm
2.Two like electric charges always do which of the following?
(a) repel each other(b) attract each other(c) have no effect on each other(d) combine into one charge
3.Electric current is defined as the rate of flow of what?
(a) charge(b) energy(c) voltage(d) resistance
4.What is the unit of electric current?
(a) ampere(b) coulomb(c) volt(d) watt
5.Which formula links charge, current and time?
(a) Q = I × t(b) Q = I ÷ t(c) I = Q × t(d) Q = V × I
6.What is potential difference measured in?
(a) volts(b) amperes(c) ohms(d) coulombs
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.Define electric current.
8.Define potential difference.
9.Define resistance and state its unit.
10.State Ohm's law.
11.How is static charge produced on an object?
12.Do like charges attract or repel each other?
13.Give one example of a conductor and one example of an insulator.
14.Write the formula linking charge, current and time, and state the unit of each quantity.
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A current of 2 A flows for 5 s. Using Q = I × t, calculate the charge that passes a point in the circuit.
16.A charge of 60 C passes a point in 20 s. Using I = Q ÷ t, calculate the current.
17.A 6 V battery is connected to a 3 Ω resistor. Using I = V ÷ R, calculate the current.
18.A current of 4 A flows through a 5 Ω resistor. Using V = I × R, calculate the potential difference across it.
19.A 12 V supply drives a current of 3 A through a resistor. Using R = V ÷ I, calculate the resistance.
20.A current of 0.5 A flows for 2 minutes. Using Q = I × t, calculate the charge that passes.
Answer Key
1. a) coulomb
2. a) repel each other
3. a) charge
4. a) ampere
5. a) Q = I × t
6. a) volts
7. Refer to solution guide.
8. Refer to solution guide.
9. Refer to solution guide.
10. Refer to solution guide.
11. Refer to solution guide.
12. Refer to solution guide.
13. Refer to solution guide.
14. Refer to solution guide.
15. Refer to solution guide.
16. Refer to solution guide.
17. Refer to solution guide.
18. Refer to solution guide.
19. Refer to solution guide.
20. Refer to solution guide.
End of Worksheet
People Also Ask
What is the unit of electric charge?
The coulomb, option (a) in this worksheet (Q1).
What do two like charges always do?
Repel each other, option (a) in this worksheet (Q2).
What is charge equal to?
Q = I × t, option (a) in this worksheet (Q5).
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