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BASIC ELECTRIC AND MAGNETIC CIRCUITS

Power and energy are two terms that are often misused. Energy can bethought of as the ability to do work, and it has units such as joules or Btu. Power, on the other hand, is the rate at which energy is generated or used, and therefore it has rate units such as joules/sor Btu/h. There is often confusion about the units for electrical power and energy.





Electrical power is measured in watts, which isarate(1J/s=1 watt), so electrical energy is watts multiplied by time—for example, watt-hours. Be careful not to say”watts per hour,”which is incorrect (eventhoughyou will see this all too often in newspapers or magazines).




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