You are given four bulbs of 25W, 40W, 50W and 60W. Which bulb has the lowest resistance?
Correct answer: B. 60 W
- A. 25 W
- B. 60 W
- C. 50 W
- D. 40 W
Explanation
The resistance of high power devices is smaller than the low power ones. The resistance of 60 watt bulb is smaller than 40 watt bulb and so on P=V2/R For a given voltage, P = 1/R. So, 60 W bulb has the lowest resistance.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Current Electricity questions
A 100 W, 200V bulb is connected to a 160 V supply. The actual power consumption would be:
What will be energy used by the battery if the battery has to drive 6.28 x 10^18 electron with potential difference of 20 V across the terminal?
If the current in electric bulb decreases by 0.5%, the power in the bulb decreases by approximately:
When a wire is compressed and its radius becomes 2R then its resistance will be:
The change in resistance of metallic conductor below 0oC?
A heater of 400 Watt was on for 5 hours what is electrical Consumption