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