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Electrical Power 14 - Northern Highlands Regional High School

c. Calculate the number of kilowatt-hours of electricity used by the alarm clock if it is left on for one year. d. Calculate the cost of using the alarm clock for one year if your town charges $0.15/kWh. 6. Using the formula for power, calculate the amount of current through a 75-watt light bulb that is connected to a 120-volt circuit in your ...