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RC Circuits

RC Circuits. We can use a resistor to slow the charging of the capacitor. C. Charge on capacitor varies with time: q = q o [1- e -t/RC ]. V. R. -Current now varies with time. -In the very short term, you can treat the capacitor like a wire. R = 0

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RC Circuits

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  1. RC Circuits

  2. We can use a resistor to slow the charging of the capacitor. C Charge on capacitor varies with time: q = qo [1- e-t/RC] V R -Current now varies with time. -In the very short term, you can treat the capacitor like a wire. R = 0 -In the long term, you can treat the capacitor like a break. R = Infinite

  3. How much charge is on the capacitor after 1ms? C= 10μF V = 20V R = 100Ω

  4. How long does it take to gain 50% of maximum Charge? C= 10μF V = 20V R = 100Ω

  5. How long does it take to gain 100% of maximum Charge? C= 10μF V = 20V R = 100Ω

  6. We can use a resistor to slow the discharging of the capacitor. C (charged) Charge on capacitor varies with time: q = qo [ e-t/RC] R -Current varies with time. -The capacitor is now driving the current -As the capacitor discharges, the voltage drops - VC = VR

  7. How much charge is left on the capacitor after 1ms? C= 10μF V = 20V R = 100Ω

  8. How long does it take to lose 70% of maximum Charge? C= 10μF V = 20V R = 100Ω

  9. What is the current through the battery in very short term?What is the current through the battery in the long term? R1 = 5Ω V =20V R2 = 10Ω C = 2μF

  10. After a long time, what is the voltage drop across the Capacitor? R1 = 5Ω V =20V R2 = 10Ω C = 2μF

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