Two lamps, one rated 100 Wat 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Two lamps, one rated 100 Wat 220 V, and the other 60 W at 220 V, are c

1.	Two lamps, one rated 100 Wat 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Answer» Solution :Given: LAMPS are connected in PARALLEL Potential difference = 220 V Power of one lamp `P_1` = 100 W Power of second lamp `P_2` = 60 W To find : Current (I) Formula : P =VI Solution : Since, both the lamps are connected in parallel their potential difference will be equal. We know, P =VI or , I=P/V `I_1=P_1/V ` and `I_2=P_2 /V ` Thus, TOTAL current through the circuit is I=`I_1+I_2` `therefore I=P_1 /V + P_2 /V` `therefore I="100 W"/"200 V"+"60 W"/"200 V"` `=(100+60)/220 =160/220` I=0.727 A `therefore ` Current is equal to 0.73 A