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    Question

    An electric bulb is rated 100 W and 220 V. What is the

    current through the bulb?  
    A 0.45 A Correct Answer Incorrect Answer
    B 0.50 A Correct Answer Incorrect Answer
    C 0.25 A Correct Answer Incorrect Answer
    D 2.2 A Correct Answer Incorrect Answer

    Solution

    Power P = VI ⟹ I = P/V = 100 / 220 = 0.45 A  This tells us how many current flows in the bulb at 220 volts.   It helps prevent overloading in circuits.   Appliances are designed with such ratings for safety.

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