Electrical relationships

voltage = current x resistance [volts = amps x ohms V = IR ]

power = voltage x current [ watts = volts x amps W = VI ]

Work, Energy and Power

Work is the mechanical expression of energy. In scientific terms, it is the exertion of force over a distance. For example, if you raise a 1 kg mass 1 meter, you have done 9.8 Newton-meters, or Joules of work. Work and energy are measured in the same units.

Energy is the capacity to do Work, and it may be exist in many different forms. Commonly encountered forms of energy are potential (a heavy weight on a stand contains potential energy), kinetic (yank the stand out from under the weight, and its movement is kinetic energy), and heat (when it crashes to the floor, the damage it does ultimately turns to heat).

Power is the rate at which work is done. One Joule of energy applied for 1 second is a Watt.

Here are the main conversion factors that relate to heat and electrical energy. The basic unit of energy and work is the Joule.

If one Joule of energy is expended every second, the power level is 1 Watt,

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