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What is the value of power if a man does 50 J of work in 10 s?
0.5 W
50 W
500 W
5 W
5 W
Power is defined as the rate at which work is done or energy is transferred. By dividing the work done (50 J) by the time taken (10 s), we calculate the power as 5 W.
Power is defined as the rate at which work is done or energy is transferred. By dividing the work done (50 J) by the time taken (10 s), we calculate the power as 5 W.
If two people climb the same set of stairs carrying the same weight, the one who reaches the top faster is doing more work in less time, meaning they have a higher power output.
P=tW — Power is the work done per unit time
1 W=1 J/s — Definition of the Watt unit
The concept of power measures how quickly work is performed. It is calculated using the formula P=tW, where P is power in Watts, W is work in Joules, and t is time in seconds.
Work done (W) = 50 J
Time taken (t) = 10 s
Power (P) is the rate of doing work
The SI unit of power is the Watt (W)
Simple relationship between energy transfer and time
Calculating efficiency of motors
Rating electrical appliances
The unit Watt is named after James Watt, the developer of the steam engine.
Option A (0.5 W) is 50/100, Option B (50 W) is incorrect, Option C (500 W) is 50×10.
D is correct — Using the formula P=tW, the power is 50 J/10 s=5 W.
Always ensure units are in SI (Joules and Seconds) before dividing to find power in Watts.
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