question_answer 12)

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Answer:

Resistance of each bulb, r = Total resistance in the circuit, R Let n be the number of bulb (each of resistance r) to be connected in parallel to obtain a resistance R. Clearly,            R =  or  n =