Question

calculate the energy used by a light bulb of power 75W in 10 seconds

Answer 1

Calculate the energy used by a light bulb of power 75W in 10 seconds ?

Answer:

The energy used by the light bulb is 750J.

Solution:

The wattage of the light bulb is 75W

We have to calculate the energy used by the bulb in 10 seconds.

We will have to use the work-power equation:

P = W/t

P - Power of the appliance

W - Work done by the appliance

t - Time

Once we fill in the known values into the equation, we get:

$75 = W/10$

After we solve this we get

$W = 750 J$

Hence, 750 J is the amount of energy used by the light bulb in 10 seconds.