Capacitance and Stored Electric Energy

Keep one parallel-plate capacitor on screen so geometry, stored charge, field strength, and stored electric energy stay tied to the same bounded battery-and-plates model.

Explore -> Understand -> Check + Continue

Lower learning flow

Explore -> Understand -> Check + Continue

Build the core picture before you start testing the idea.

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Lower learning flow

Step 1 of 3Explore

Build the core picture before you start testing the idea.

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Step 1 of 32 sections

Explore

Build the core picture before you start testing the idea.

What to do here

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What to notice

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Why it behaves this way

Explanation

Capacitance tells you how much charge a capacitor stores for each volt across it. This bench keeps one battery attached to one bounded pair of parallel plates so geometry, stored charge, field strength, and stored electric energy stay tied to the same setup.

The capacitor story stays geometric first. Plate area and plate separation set the capacitance, then the battery voltage determines how much charge builds on the plates and how much electric energy is stored in the field between them.

Key ideas

01For this bounded model with epsilon = 1 in displayed units, capacitance follows C = A / d.

02At fixed voltage, stored charge follows Q = CV.

03Stored electric energy follows U = 1/2 C V^2, so energy grows faster with voltage than charge does.

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Stable links

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