Question

An electric lamp whose resistance is 8 ohms and a conductor of 2 ohms resistance are connected in series to a 5 volt battery. Calculate (A) The total resistance of the circuit. (B) The current through the circuit. (C) The potential difference across the electric lamp and the conductor
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Answer 1

Explanation:

). the total resistance of the circuit =20Ω+4Ω=24Ω

b). The current through the circuit= current through the bulb= current through the conductor.

The current through the circuit=

the voltage of the battery

voltage applied

.

the current through the circuit =

24

6

amp

The current through the circuit = 0.25amp

c). The potential difference across the lamp and the conductor.

(i) The potential difference across the electrical lamp =0.25×20=5volt

(ii) The potential difference conductor =0.25×4=1 volt

d). Power can be calculated as

current through the lamp

voltage across the lamp

power=

0.25

5

→20W.