A person consumes about 2300 Cal a day. 1 Cal = 4186 J and 1 kWh= 860 Cal.If a power company charges about 12 ¢ per kilowatt-hour, how much would this energy cost per day if the person bought it from the power company?

A power of 120 kWkW (1.2×105 WW) is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000 VV. Part A - If each of the two lines has a resistance of 10 ΩΩ, find a change of voltage along each line. (Think carefully. This voltage change is along each line, not between the lines.). P = Part B - Find what is the power expended as heat in both lines together (distinct from power delivered to customers). P =

The energy needed to run an electric circuit can be expressed by E=IVt, where I is the electric current in the circuit, V is the voltage across the circuit, and t is the amount of time that it runs. How much time would it take a 2000 kg electric car to go from rest to a speed of 35 m/s if the electric motor runs on 375 V and the system uses 628 Amps of current while accelerating?   Note for formula:  I is uppercase i.

The power consumed by a device drawing a 0.8 A when connected to 120 V is A) 12 W B) 15 W C) 60 W D) 120 W E) 96 W hp