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1- If the resistance of the headlights of a car were 7.2 , then, Calculate the electrical power (in watts) if the headlights were designed

1- If the resistance of the headlights of a car were 7.2 , then, Calculate the electrical power (in watts) if the headlights were designed for 20 V?

2- An electric heater consumes a constant 15.0 A on a 120 V line. How much energy does it require and how much does it cost per month (31 days) if it operates 3.0 h per day and the electric company charges 21.2 cents per kWh?

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