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?

Answer rating: 100% (QA)

1 To calculate the electrical power in watts used by the headlights of the car we can use the formul... View the full answer