Question

Define power derive its si unit. An electric bulb is rated 10 w. What does it mean? What is the energy consumed in joules if it is used for 5 minutes ?

Answer 1

The rate of doing work is called Power. If a load is rated at 10W, it means it consumes 10J of energy per second. As work done = Power*time(in seconds)
energy = 10*5*60 = 3000J

Answer 2

The energy consumed by the electric bulb is 3 kJ.

Explanation:

The rate at which the work is done is called power. It is given by :

$P=\dfrac{W}{t}$

The SI unit of work done is joules and that of time is seconds. So, the SI unit of power is J/s. It is equal to watts.

An electric bulb is rated 10 W. It means that the bulb consumes 15 joules of energy in a second.

The energy consumed in joules if it is used for 5 minutes or 300 seconds.

$P=\dfrac{E}{t}\\\\E=P\times t\\\\E=10\ W\times 300\ s\\\\E=3000\ J\\\\E=3\ kJ$

So, the energy consumed by the electric bulb is 3 kJ.

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