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# 11.3. Capacitance

Capacitors are electrical components used in almost all electronic devices around us. They are really useful for a number of reasons, including timing, smoothing and rectification. They are remarkably simple in their structure - two conductive parallel plates separated by an insulator. The main function of a capacitor is to store electrical charge, one plate being positive and one plate being negative. We are going to explore a bit into the structure of these things, as well as how they can be useful in circuits.
Before we do, I'd like to introduce you to 'ElectroBoom', aka Mehdi Sadaghdar - a YouTuber who puts up lots of great electricity videos, most of which involve him shocking himself in various elaborate ways. Here he looks at these capacitor things.

I have divided this subsection into the following bits:

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Capacitors and Capacitance

#### Capactors and Capacitance

So, how exactly do these capacitors work?

## Video Lessons

 Chris Doner Capacitance IB Specific Khan Academy Capacitors and Capacitance Capacitance Energy of a Capacitor Science Shorts Capacitors Practical Tips

## Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Capacitance Mr. G 11.3 Teaching Notes 11.3 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes Capacitance Flashcards A Level Resources - content slightly different

## Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Dr French's Eclecticon Electric Fields & Capacitors Electric Fields & Capacitors Solutions Link to Dr French's Site Extension: Pre-University Material Grade Gorilla 11.3 (Capacitance) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Isaac Physics Charge and Energy Stored on a Capacitor Mr. G 11.3 Formative Assessment Topic 11 Summary Qs IB Specific Questions Physics and Maths Tutor Capacitors (Edexcel 1) Capacitors MS (Edexcel 1) Capacitors (OCR) Capacitors MS (OCR) A-Level Qs: overlapping content Physics and Maths Tutor Capacitance (AQA 1) Capacitance MS (AQA 1) Capacitance (AQA 2) Capacitance MS (AQA 2) A-Level Qs: overlapping content Physics and Maths Tutor Parallel Plate Capacitors (AQA 2) Parallel Plate Capacitors MS (AQA 2) Capacitor Energy (AQA 2) Capacitor Energy MS (AQA 2) A-Level Qs: overlapping content Physics and Maths Tutor MCQ Capacitance 1 (AQA 2) MCQ Capacitance 1 MS (AQA 2) MCQ Capacitance 2 (AQA 2) MCQ Capacitance 2 MS (AQA 2) A-Level Qs: overlapping content

Dielectrics

## Video Lessons

 Chris Doner Capacitance (Dielectrics) IB Specific Khan Academy Dielectrics in Capacitors

## Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Capacitance Mr. G 11.3 Teaching Notes 11.3 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes Capacitance Flashcards A Level Resources - content slightly different

## Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.3 (Capacitance) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Mr. G 11.3 Formative Assessment Topic 11 Summary Qs IB Specific Questions
Combining Capacitors

## Video Lessons

 Chris Doner Capacitance (Combining Capacitors) IB Specific Khan Academy Capacitors in Series Capacitors in Parallel

## Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Series and Parallel Mr. G 11.3 Teaching Notes 11.3 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes Capacitance Flashcards A Level Resources - content slightly different

## Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.3 (Capacitance) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Isaac Physics Capacitor Networks Mr. G 11.3 Formative Assessment Topic 11 Summary Qs IB Specific Questions
Charging/ Discharging

#### Charging/ Discharging Capacitor Circuits

When releasing their charge through a circuit, capacitors follow an exponential decay.

## Video Lessons

 Chris Doner Charging and Discharging IB Specific Science Shorts Capacitor Discharge Practical Tips

## Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Exponentials Maths Recap Charging and Discharging Isaac Physics Charging and Discharging Mr. G 11.3 Teaching Notes 11.3 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes Capacitance Flashcards A Level Resources - content slightly different

## Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.3 (Capacitance) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Isaac Physics Discharge of a Capacitor Mr. G 11.3 Formative Assessment Topic 11 Summary Qs IB Specific Questions Physics and Maths Tutor Charging & Discharging (AQA 2) Charging & Discharging MS (AQA 2) A-Level Qs: overlapping content