Question

A 200 w and 100 w bulb are connected in series across a 220v supply. The power consumed by them will be?

Answer 1

Given

Two bulbs are 200 W and 100 W

both the bulbs  are connected to a - 220 V supply in series

both of them are working at - 220v supply

To find

The power consumed by both of them?

Solution

This can be solved by using the equation for power -

The solution to this question is as follows

Ps = $\frac{P1P2}{P1+P2}$----------------- Equation 1

• We know that P1=200w
• And P2=100w

Ps= $\frac{200*100}{200+100} ------ equation 2$

Ps =    $\frac{20000}{200+100}$

Ps = $\frac{20000}{300}$

Ps = $\frac{200}{3}$

Ps = 67watts

So we get the power consumed by the bulbs = 67watts