SUMMARY

Monday, 13 August 2018

12:17 PM

Machine generated alternative text: Topicl Recap • Current is the rate of flow of electrons in a conductor. dq dt • q = dt + q(to), to S t • Voltage is the potential difference between two points of the circuit (difference in charge between two locations): dw • Vab = Va — Vb dq • They are described by their values and direction/polarity. • DC and AC voltage/current. • DC (direct current): Not changing direction/polarity. • AC (alternating current): Changing direction/polarity. • Power and energy dt • w = p dt = vi dt, 2

 

Machine generated alternative text: Topicl Recap • Passive sign convention Power is positive if the current enters the positive terminal, p = +vi. Power is negative if the current enters the negative terminal, p = —vi. — Positive power is absorbed/dissipated by an element. Negative power is supplied/generated by an element. • Conservation of energy • Sources Voltage sources generate or dissipate power at a specified voltage with whatever current is required. Current sources generate or dissipate power at a specified current with whatever voltage is required. — Sources can be ideal/real, dependent/independent. 3

 

 

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