A light bulb is supplied with 100 J of energy each
second.
a How many joules of energy leave the bulb
each second in the form of heat and light?
b If 10 J of energy leave the lamp each second
in the form of light, how many joules leave
each second in the form of heat?

The amount of property that is needed by a body or an object to work is called energy. It is conserved and can only be transferred from one object to another. It is estimated in Joules, calories or kW -h.

The energy that leaves the lamp is a. 95 J and b. 90J.

This can be estimated as:

a. According to the conservational law of energy:

Given,

Substituting values in the equation:

b. Applying the same law:

Given,

Substituting values:

Therefore, energies released are a. 95 J and b. 90J.

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a.95J

b.90J

Explanation:

a.Applying energy conservation laws:-

Energy  Into Bulb=

Given  that light energy=5J,and Total Energy=100J

b. Applying the laws in a above.

Total Energy=100J

Light Energy=10J

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