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Lecture 18 - RC circuits

# Lecture 18 - RC circuits - RC circuit = circuit with...

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1 Lecture 18 RC circuits RC circuit = circuit with resistors and capacitors. R The simplest one: C ε R Charging the capacitor Capacitor initially uncharged. At t = 0, C + – – ε close the switch. + t = 0 + : (right after) (0) I R Current flows “through” C as through an ideal wire (0) 0 Q R ε C +++ ––– Charge builds up on the capacitor’s plates, and C ( ) ( ) Q t V t C E battery E C ( t ) At t : ( ) 0 I C acts like an open switch ( ) Q C After a long time, and charges cannot move. C V Adding charge to the plates is more and more difficult.

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2 Q t ( ) Q C (0) 0 Q C R I t ( ) 0 I (0) I R ε ACT: Charging a capacitor The capacitor in the circuit below is initially uncharged. What is its charge Q ( ) a long time after the switch is closed? R 1 R 2 A. Q ( ) < C B. Q ( ) = C C. Q ( ) > C C When the capacitor is fully charged and behaves like an open switch, there is still current in this circuit!
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Lecture 18 - RC circuits - RC circuit = circuit with...

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