What is the line on a current-potential difference graph like and what does this tell us?
The line is curved so the current is not directly proportional to the potential difference (pd).
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What happens to the resistance of the filament in a filament bulb and why?
The resistance increases as the current increases because the resistance increases as the temperature increases.
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What difference does reversing the potential difference (pd) make to the shape of the curve on a current-potential difference graph for a filament bulb?
It makes no difference to the shape of the curve.
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How does the current through a diode flow and what happens when this direction is reversed?
The current through a diode flows in one direction only, in the reverse direction the diode has a very high resistance so the current is zero.
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What happens to the resistance of a light-dependent resistor (LDR) as the light falling on it gets brighter?
The resistance decreases.
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What happens to the resistance of a thermistor as the temperature goes up?
The resistance goes down.
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How can current-potential difference be plotted on the graph?
With the current on the x-axis or the y-axis as long as you know the shape either way round and check which way round they are given in exam questions.
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What happens to he resistance of an LDR if its surroundings become darker?
The resistance of the LDR increases.
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What effect does reversing the pd across a filament bulb have on the current-potential difference curve?
Reversing the pd has no effect on the current-potential difference curve for the filament bulb.
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**LOOK UP A CURRENT-POTENTIAL GRAPH FOR A FILAMENT BULB**
**LOOK UP A CURRENT-POTENTIAL DIFFERENCE GRAPH FOR A DIODE**
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Other cards in this set
Card 2
Front
What happens to the resistance of the filament in a filament bulb and why?
Back
The resistance increases as the current increases because the resistance increases as the temperature increases.
Card 3
Front
What difference does reversing the potential difference (pd) make to the shape of the curve on a current-potential difference graph for a filament bulb?
Back
Card 4
Front
How does the current through a diode flow and what happens when this direction is reversed?
Back
Card 5
Front
What happens to the resistance of a light-dependent resistor (LDR) as the light falling on it gets brighter?
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