Question

solve the following example -:
two tungstungs bulb of wattege 100 W and 60 W power work on 220 volts potential difference. if they are connected in parallel how much current flow in the main conductor?​

Answer 1

Answer

Potential remains same in the resistors when they are connected in the parallel.∴ Potential in both the bulbs will be same.  

Now, 

For First Tungsten Bulb, 

Power=100W.

Potential=220V.

Power=Potential∗Current.

Current=220100

Current=0.45A.

For second Tungsten bulbs, 

Power =60W.

Potential =220V.

Current =22060=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.