Answer :

The combined resistance R of three resistors (or electrical devices) R_{1} R_{2} and R_{3}, connected in parallel is given by the formula:

Here, Resistance of electric lamp, R_{1} = 100

Resistance of toaster, R_{2} = 50

Resistance of water filter, R 3 = 500

Putting these values of R_{1} R_{2} and R_{3} 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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