what is the resistance of a bulb of 40w connected in a line of 70v​

Question

what is the resistance of a bulb of 40w connected in a line of 70v​

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Euphemia 1 week 2021-07-22T10:05:49+00:00 1 Answers 0 views 0

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    2021-07-22T10:07:18+00:00

    Answer:

    122.5 ohm

    Explanation:

    Given :

    P=40 w

    V= 70 V

    R=?

    Resistance can be calculated as :

    P=\frac{V^{2} }{R} \\40=\frac{(70)^{2} }{R}\\40=\frac{4900}{R} \\R=\frac{4900}{40} \\R=122.5 ohm

    Therefore, resistance of the bulb will be 122.5 ohm

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