# An electric lamp

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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