Transcription of Voltage Divider Capacitor RC circuits
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Voltage Divider Capacitor RC circuits
Physics 120/220. Voltage Divider Capacitor RC circuits Prof. Anyes Taffard Voltage Divider 2. The figure is called a Voltage Divider . It's one of the most useful and important circuit elements we will encounter. It is used to generate a particular Voltage for a large fixed Vin. Vin Current (R1 & R2) I =. R1 + R2. Output Voltage : R2. Vout = IR2 = Vin Vout Vin Voltage drop is R1 + R2 proportional to the resistances Vout can be used to drive a circuit that needs a Voltage lower than Vin. Voltage Divider (cont.) 3. Add load resistor RL in parallel to R2. You can model R2 and RL as one resistor (parallel combination), then calculate Vout for this new Voltage Divider R2. If RL >> R2, then the output Voltage is still: VL = Vin R1 + R2. However, if RL is comparable to R2, VL is reduced. We say that the circuit is loaded . Ideal Voltage and current sources 4.
The voltage across the capacitor increases with time according to: A is determined by the initial condition: @ t=0, V=0 thus A=-V i Time constant RC: For R Ohms and C in Farads, RC is in seconds For MΩ and µF, RC is seconds For kΩ and µF, RC is ms I=C dV dt = V i−V R V=V i+Ae −t RC V=V i 1−e −t (RC) @ 1RC 63% of voltage @ 5RC 99% of ...
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