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Capacitors
Definitions/ Quick-fire questions
Question | Answer |
---|---|
What do capacitors do, and what is needed to do it? | |
What is the definition of capacitance? | |
Why do we always charge and discharge capacitors through a resistor? | |
What is the energy stored in a capacitor equal to? (Three answers) | |
Draw 4 graphs to show how current in the circuit and p.d. across capacitor changes with time when charging and discharging. | |
When fully charged, what is the p.d. across the resistor? | |
What happens to energy stored if voltage is doubled? | |
What is ex, and its limits? | |
What 3 things fall away according to e-t/RC? | |
When t=RC, this gives e-1. What is this ratio/percentage equal to? |