Question

Two tungsten bulbs of wattage 100w and 60w power work on 220v potential difference. If

they are connected in parallel, how much current will flow in the main conductor ?​

Answer 1

Potential remains same in the resistors when they are connected in the parallell.

Potential in both the bulbs will be same.

Potential in both the bulbs will be same. Now,

For First Tungsten Bulb,

For First Tungsten Bulb, Power=100W.

For First Tungsten Bulb, Power=100W.Potential=220V.

For First Tungsten Bulb, Power=100W.Potential=220V.Power=Potential∗Current.

Current=

$\frac{100}{220}$

Current=0.45A

For second Tungsten bulbs,

For second Tungsten bulbs, Power =60W.

For second Tungsten bulbs, Power =60W.Potential =220V.

Current=

$\frac{60}{220}$

Current=0.27A

Now, Total current flowing = Current in 1st bulb + Current in 2nd bulb.=0.45+0.27=0.72A.

Hence, the total current flowing in the main conductor is 0.72A.