-Brandon Davis, Norwood MA
Additional Answer
Power is the rate at which energy is expended. In other words, power is energy divided by time. Power is measured in watts, while energy is measured in joules. So, the watt is equivalent to a joule per second.
For the purpose of billing its customers, energy companies use the kilowatt hour, rather than the joule, kilojoule, or megajoule, to measure energy consumption. Since power is energy divided by time, then energy is power times time. If power is measured in kilowatts, and time in hours, then energy can be measured in kilowatts x hours, or kilowatt hours (kW.h).
Power is the time derivative of energy.
60 joules of energy delivered over the course of a second = 60 watts of power
60 joules of energy delivered over the course of a microsecond = 60 megawatts of power
Well one day energy was feeling lonely and went to a pub. He met a girl who had the power. They went back to his and had a little "shock and awe". And 9 months later they produced a little electricity named voltage. They are happily married now with a "spark" between them. ;)
Electric power is the rate at which electric energy is transferred by an electric circuit
