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Question

A resistor of 4-ohm resistance and an electric lamp of 20-ohm resistance are connected in series across a 6-volt battery. Draw a labelled circuit diagram by using the symbols for ohm and volt. Calculate:
(a) total resistance of the circuit.
(b) current flowing through the circuit.
(c) potential difference across the resistor.
​(d) potential difference across the electric lamp.

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Solution



(a) 4-ohm resistance and 20-ohm lamp are connected in series. Hence, the total resistance of the circuit = 4 Ω+20 Ω = 24 Ω

(b) Current flowing in the circuit = VoltageTotal resistance=6 V24 Ω=0.25 A

(c) The potential difference across the resistor = Current through the resistor × Resistance = 0.25 A × 4 Ω=1 V

(d) The potential difference across the lamp = Current through the lamp × Resistance = 0.25 A × 20 Ω=5 V

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