Q. 24.2( 137 Votes )

An electric lamp of 100, a toaster of resistance 50 , and a water filter of resistance 500 are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

Answer :

The combined resistance R of three resistors (or electrical devices) R1 R2 and R3, connected in parallel is given by the formula:


Here, Resistance of electric lamp, R1 = 100


Resistance of toaster, R2 = 50


Resistance of water filter, R 3 = 500


Putting these values of R1 R2 and R3 in the above formula, we get:





Thus, the resistance of electric iron will also be 31.25.


Now, Potential difference, V= 220 V


Current, I =?



Thus, the current passing through the electric iron is 7.04 amperes.


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