Electricity

4 marks · Normal

Figure 1 shows a simple circuit with a 9 V battery connected in series with a fixed resistor (3 Ω) and a bulb (3 Ω).

(a)

Calculate the total resistance in the circuit.

[1 mark]

(b)

Determine the current flowing through the circuit.

[2 marks]

(c)

State the voltmeter reading if it is connected across the bulb only.

[1 mark]

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(a) 6 Ω

(b) 1.5 A

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Marking points

B1 (a) · 1 mark · Correct total resistance (series: 3 Ω + 3 Ω = 6 Ω).

M1 (b) · 1 mark · Uses I = V / R for total circuit.

A1 (b) · 1 mark · Accurate calculation: I = 9 / 6 = 1.5 A. (follow-through)

A2 (c) · 1 mark · Correct voltage across bulb (I × R = 1.5 × 3 = 4.5 V). (follow-through)

Worked solution