Question

2 lamps rated 100w 220v and 25w 220v are connected in parallel to 220v supply calculate total current through circuit

Answer 1

current of 1 lamp=P/ V
                           = 100/220
                          =5/11

current through 2 lamp=P/V
                                   = 25/220
                                    = 5/44
total current through the lamp=5/11+5/44=25/44

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Answer 2

Here we use I =P/V where , I -current , P-power ,V-volt

*CURRENT THROUGH 1st LAMP* ( I ) = 100/220 =5/11

THEREFORE, Current flowing through first lamp is 5/11

*CURRENT THROUGH 2nd LAMP* (I') = 25/220 =5/44

SINCE, CURRENT flowing through second lamp is 5/44

The *TOTAL* CURRENT FLOWING THROUGH THE LAMP is

= 5/11 + 5/44 ( by taking LCM we get )

= 25 / 44

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