Eight 7.0W Christmas tree lights are strung in series to a 110 V light source. What is the resistance of each bulb?

Question

Eight 7.0W Christmas tree lights are strung in series to a 110 V light source. What is the resistance of each bulb?

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Thạch Thảo 5 years 2021-07-26T12:43:04+00:00 1 Answers 20 views 0

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  1. kimcuc
    0
    2021-07-26T12:44:30+00:00
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    Answer:

    Resistance = 1728.57 Ohms

    Explanation:

    Given the following data;

    Power = 7 Watts

    Voltage = 110 Volts

    To find the resistance of each bulb;

    Mathematically, power can be calculated using the formula;

    Power = \frac {Voltage^{2}}{resistance}

    Making resistance the subject of formula, we have;

    Resistance = \frac {Voltage^{2}}{power}

    Substituting into the formula, we have;

    Resistance = \frac {110^{2}}{7}

    Resistance = \frac {12100}{7}

    Resistance = 1728.57 Ohms

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