In a series circuit the current is the same at every point and the component voltages add up to the supply voltage, so this Year 10 sheet opens with the two series rules. The key records V = I × R and a fuse for blocking an overly large current.
Key Takeaways
In series, current is the same at every point (Q1).
In series, component voltages add up to the supply voltage (Q2).
The key records V = I × R as the circuit equation.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.In a series circuit, the current at every point is what?
(a) the same(b) different(c) largest at the battery(d) zero everywhere
2.In a series circuit, the voltages across the components do which of the following?
(a) add up to the supply voltage(b) each equal the supply voltage(c) are always zero(d) never add up
3.In a parallel circuit, the voltage across each branch is what?
(a) the same(b) different(c) half the supply voltage(d) always zero
4.Which formula represents Ohm's law?
(a) V = I × R(b) I = V × R(c) V = I ÷ R(d) R = V × I
5.In a series circuit, the total resistance is what?
(a) the sum of all the resistances(b) less than the smallest resistance(c) always 1 Ω(d) always zero
6.What is the function of a fuse in a circuit?
(a) to protect the circuit from too large a current(b) to reduce the voltage(c) to store static charge(d) to block magnetic fields
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.State the rule for the current in a series circuit.
8.State the rule for the voltage in a series circuit.
9.State the rule for the voltage in a parallel circuit.
10.Define resistance and state its unit.
11.What is the function of a variable resistor?
12.What is the function of a fuse?
13.Give one difference between a series circuit and a parallel circuit.
14.State Ohm's law in words.
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.Three resistors of 2 Ω, 3 Ω and 5 Ω are connected in series across a 20 V supply. Calculate the total resistance, then use I = V ÷ R to find the current.
16.Two 6 Ω resistors are connected in parallel. Using 1 ÷ R = 1 ÷ R1 + 1 ÷ R2, calculate the total resistance.
17.A 9 V battery is connected to a 3 Ω resistor. Using I = V ÷ R, calculate the current.
18.A current of 2 A flows through a 4 Ω resistor. Using V = I × R, calculate the potential difference across it.
19.Resistors of 2 Ω and 4 Ω are connected in series across a 12 V supply. Calculate the total resistance, the current, and the voltage across the 4 Ω resistor.
20.A lamp draws a current of 0.5 A when connected to a 6 V supply. Using R = V ÷ I, calculate its resistance.
Answer Key
1. a) the same
2. a) add up to the supply voltage
3. a) the same
4. a) V = I × R
5. a) the sum of all the resistances
6. a) to protect the circuit from too large a current
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 current at every point in a series circuit?
The same, option (a) in this worksheet (Q1).
What do the voltages across series components do?
They add up to the supply voltage, option (a) in this worksheet (Q2).
What is Ohm's law?
V = I × R, from the answer key on this page.
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