1.

Two lamps rated 100W,220V and 25W,220V are connected in parallel to 220V supply. Calculate the total current through the circuit.

Answer»

Solution :In parallel grouping VOLTAGE remains same across each LAMP. Hence, currents `I_1 and I_2` flowing through 2 lamps are:
`I_1=P_1/V=100/220=5/11 A`
and `I_2=P_2/V=25/220=5/44 A`
`THEREFORE` Total CURRENT `I=I_1+I_2=5/11+5/44=(20+5)/44=25/44 A`


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