Force and energy are two terms that are often incorrectly. Energy can bethought of ability to work, and has units as joules or escaped. Power on the other hand, is the rate at which energy is generated or used, and therefore there are rate units as joules/sor escaped/h. Often is confusion units for electrical power and energy. Electrical power is measured in Watts, which isarate (1J/s = 1 Watt), so that electrical power is Watts multiplied by time — for example, watt-hours. Be careful not to say "Watts per hour," which is incorrect (eventhoughyou will see this too often in newspapers or magazines). When your battery, presents the current load, power is generated from the battery and is dissipated by the load. We may combine (1.1) and (1.2) to find an expression for the instantaneous power supplied or consumed by the component of the chain. Key electrical quantities, which are already in place and the links between these quantities are summarized in table 1.1. Since electrical quantities differ over suchalargerange variables, you will often find themselves working with very small quantities and very large quantities. For example, the voltage created by your TV antenna, perhaps measured in parts per million volt (microvolts, µV), while the power generated by the large power station might be measured in billions of Watts, or gigawatts (GW). For a description of the quantities which may be of these extreme values, it is useful to have a system of prefixes, which accompanied the units. The most commonly used prefixes in electrical engineering are listed inT able 1.2.Download: basic ELECTRIC and magnetic CIRCUITS
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