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A bulb is rated at 200 V - 40 W. What is its resistance ? 5 such bulbs are lighted for 5 hours. Calculate the electrical energy consumed.

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A bulb is rated at 200 V - 40 W. What is its resistance ? 5 such bulbs are lighted for 5 hours. Calculate the electrical energy consumed. Find the cost if the rate is Rs.5.10 per kWh.

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Given, V = 200 V, P = 40 W

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