Definition of Power

p=dwdt, (1.3)
where
p=the power in watts,w=the energy in joules,t=the time in seconds.
Thus, 1 W is equivalent to 1 J/s.
The power associated with the flow of charge follows directly from the
definition of voltage and current in Eqs. 1.1 and 1.2, or
p=dwdt=(dwdq)(dqdt),

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