Question

an electrical lamp is marked 220 volt 100 watt . it is used for 5 hours daily calculate​

Answer 1

Answer:

Given :

power =p=100w

voltage=220V

time=2hrs

Resistance=R=?

Formula to be used :

P=V*I

BUT I=V/R

∴P=V²/R

⇒R=V²/P

      =220x220/100

       =484ohms

To calculate Energy consumed :

Formula : E=Pxt

                  =100x5

                  =500Wh

                  =500/1000 kWh

                  0.5 kWh

    ∴ Resistance while glowing is 484 ohms and  energy consumed in kWh per day ps 0.5