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Unit 4 Fields and their Applications

Quick questions on Capacitance: stored energy and exponential discharge - WJEC A-Level Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is energy stored?
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The energy stored is the area under the charge-voltage graph, which is a triangle, giving the factor of one half.
What is q1?
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A 100 μF100\,\mu\text{F} capacitor is charged to 12 V12\,\text{V}. Find the energy stored. [2 marks]
What is q2?
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A capacitor discharges through a 2.0 kΩ2.0\,\text{k}\Omega resistor with capacitance 50 μF50\,\mu\text{F}. Find the time constant. [2 marks]

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