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Edexcel | Physics WPH0 | W 16 4 1 | 1 hour 30 minutes

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13

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Some lights are designed to dim gradually after being switched off. This can be done

using a capacitor in a timer circuit.

The circuit diagram shows how a potential difference (p.d.) can be supplied across a

resistor for a limited time.

13

(a)

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When the switch is at position A, the capacitor charges.

13

(a) (I)

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2 Mark s

In terms of the movement of electrons, explain what happens to the capacitor as it

becomes fully charged.

The idea that electrons move from one plate to the other plate through the

external circuit

When fully charged there is no movement of electrons

Or As capacitor charges, rate of flow of electrons decreases

Or (when fully charged) p.d. across the plates/capacitor is equal (and opposite)

to the supply p.d.

Or (when fully charged) equal and opposite charge/electrons on each plate

13

(a) (II)

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2 Mark s

Calculate the energy stored in the charged capacitor.

Energy =

13

(b)

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The switch is moved to position B and the capacitor discharges through the resistor.

13

(b) (I)

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2 Mark s

Describe what happens to the current through the resistor.

Current decreases (over time)

Exponentially

(a graph of I/t with I decreasing can score MP1. Must be indicated as

exponential for MP2)

13

(b) (II)

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3 Mark s

Calculate the resistance of the resistor in the circuit.

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