CIE A Level Physics复习笔记19.1.3 Capacitors in Series & Parallel

Category: A-level课程, 教材笔记, 福利干货 Date: 2022年8月17日上午11:30

Capacitors in Series & Parallel

Recall the formula for the combined capacitance of capacitors in series:

In parallel:

C_total = C₁+ C₂ + C₃ ...

Worked Example

Three capacitors with capacitance of 23 μF, 35 μF and 40 μF are connected as shown below WE Capacitors in Series & Parallel question image, downloadable AS & A Level Physics revision notes

Calculate the total capacitance between points A and B

Step 1: Calculate the combined capacitance of the two capacitors in parallel

Capacitors in parallel: C_total = C₁+ C₂ + C₃ …

C_parallel= 23 + 35 = 58 μF

Step 2: Connect this combined capacitance with the final capacitor in series

Step 3: Rearrange for the total capacitance

Exam Tip

Both the combined capacitance equations look similar to the equations for combined resistance in series and parallel circuits. However, take note that they are the opposite way around to each other!

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