Question

two lamps 60 watt and 220 volt 40 watt and 220 volt are connected in parallel in electricity supply to 20 volt draw the circuit diagram to show the connection calculate the current drawn from supply calculate the total energy consumed when lamp operate for 1 hour

Answer 1

We all know that current=power/time

current-->(I),

Power--> P

Time-->t

--> I=P/t

so that

P1 = 100Watt  & V= 220v

P2 = 60Watt &  V= 220v

so that

I1=P1/t1

100/220 =1/22 = 0.4545

and now,

I2=P2/t2

60/220 =6/22 = 0.2727

and now add these both current to get new is

0.4545 + 0.2727 =0.727 A

Inew =0.727A

Inew= 0.8 A