Skip to content
doubtly
Sign up
Log in to upvote 0 Log in to downvote

An electric tungsten bulb is connected into a home circuit. The home electric supply runs at 220 volt potential difference. When switched on, a current of 0.45 A flows through the bulb. What must be the power (wattage) of the bulb ? If it is kept ‘on…

Q.2 (B)(iv) An electric tungsten bulb is connected into a home circuit. The home electric supply runs at 220 volt potential difference. When switched on, a current of 0.45 A flows through the bulb. What must be the power (wattage) of the bulb ? If it is kept ‘on’ for 10 hours, how many units of electricity will be consumed ?

Doubtly Asked ssc 10th Save WhatsApp Report
Sign in to comment

1 answer

Log in to upvote 0 Log in to downvote

Best answer

Answer: About 99 W; about 1 unit (0.99 kWh).

Power \(P = VI = 220 \times 0.45 = 99\) W, so the bulb is of 100 W.

Electrical energy used = \(P \times t = 99\ \text{W} \times 10\ \text{h} = 990\ \text{Wh} = 0.99\ \text{kWh}\). Since 1 unit = 1 kWh, the bulb consumes about 1 unit of electricity.

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report
Was this answer helpful?
Sign in to comment

Your answer

Log in or create a free account to answer this question.