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Unformatted text preview: tion. Recall from basic physics that power is the time rate of expending or absorbing energy. (A water pump rated 75 kW can deliver more lite$ per secord than ore rated 7.5 kW.) Mathematically, energy per unit time is er-Dressed in the form of a derivative. or (1.3) ,:'H,., Definition of power > Power equation > the power rn watts, the energy in joules, the time in sconds. Thus 1W is equivalent to 1 J/s. The powei associated with the flow of charge follows directly from the definition of voltage and current in Eqs.1.1and 1.2,or (1.4) aw / aw\( aq\ dt \ dq l\dt J' p : t}le power in watts, 1) = the voltage in volts, i : the curent in amperes,...
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This note was uploaded on 07/05/2010 for the course EE 100 taught by Professor Boser during the Spring '07 term at University of California, Berkeley.
- Spring '07