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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?

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Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

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Knowledge Check

  • Two identical heaters rated 220 V, 1000 W are placed in series with each other across 220 volt line, then the equivalent combined power in the circuit is :

    A
    1000 W
    B
    2000 W
    C
    500 W
    D
    4000 W

  • In India, electricity is supplied for domestic use at 220V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R , then resistance of a 60 W bulb for use in USA will be

    A
    R
    B
    2R
    C
    R/2
    D
    R/4

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