CIE A Level Physics復(fù)習(xí)筆記19.1.3 Capacitors in Series & Parallel

Category: A-level課程, 教材筆記, 福利干貨 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?= C_1?+ 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?= C_1?+ 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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