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17 Cards in this Set

  • Front
  • Back
Capacitance
Charged stored per volt
Area under a graph of potential difference against charge stored
Energy stored on a capacitor
Electrical energy stored by the capacitor is caused by...
Charge building up on the capacitor
Current flows in a circuit with a capacitor until...
The capacitor is fully charged
Electrons flow onto the plate connected to the negative terminal of the battery which...
becomes negatively charged and repels electrons off the plate connected to the positive terminal making it positive
The charge on the two capacitor plates are...
equal and opposite
A potential difference between the two plates is caused by...
The equal and opposite charges on them.
Dielectric
An insulating material separating the two plates
A capacitor
A device used to store electrical charge made from two electrically conductive plates separated by a dielectric material.
The current in a circuit with a capacitor
Starts high but falls to zero when p.d. across the battery is equal to the p.d. across the capacitor (e.g. the capacitor is fully charged)
To discharge a capacitor
Disconnect it from the battery and connect it to a resistor.
When a capacitor discharges
A current is driven through the circuit by the p.d.
The current flows in the opposite direction to the charging current
Factors affecting time taken to charge/discharge a capacitor
Capacitance - effects the amount of charge that can be transferred
Resistance - Effects the amount of current in the circuit
Relationship between charge and time
Charge on a capacitor decreases exponentially
Relationship between potential difference and time
potential difference across a capacitor decreases exponentially
Relationship between the graphs for V against t for a discharging capacitor and I against t of a charging capacitor
They are the same
Time constant
Resistance x Capacitance