Question

calculate the power of a light bulb that uses 40j of electricity in 4 seconds

Answer 1

Answer:

1 joule per second can be termed as one watt. So a lamb or a bulb which consumes 40 joules of energy in 4 second has a wattage of 10.

Answer 2

The power of a light bulb is 10 W

Given:

The work done by the light bulb = 40 J

The time is taken for energy to pass = 4 Seconds

To find:

The power of the light bulb

Solution:

Power is where the energy or the work done that is produced by a certain time. Power is denoted by Watt as its units.

The formula for Power is,

Power = Work done / Time

Here Work done is given as 40 J

Time is given as 4 seconds

Substitute the following in the formula,

P = 40 J / 4

P = 10 W

Therefore, the power of a light bulb is 10 W

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