# P2 4.3: Resistance.

All information was taken directly from the AQA revision guide with only the key points from P2 4.3.

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• Created by: JSpencer
• Created on: 07-03-16 14:06
What does an ammeter measure?
The current through a component.
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Where are ammeters always placed?
In series with the components.
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What does a voltmeter measure?
The potential difference across a component.
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Where are voltmeters always paced?
In parralel with the componets.
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What is the potential diiference, work done and charge equation?
V = W divided by Q
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What does 'V' stand for? Units?
Potential difference in Volts, V
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What does 'W' stand for? Units?
Work done in Joules, J
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What does 'Q' stand for? Units?
Charge in coulombs, C
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What can W be changed for?
E
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What does 'E' stand for? Units?
Energy transferred in Joules, J
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What is resistance? Unit?
Opposition to current flow, in ohms.
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What is the resistance equation?
R = V divided by I
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What does 'R' stand for? Units?
Resistance in ohms.
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What does 'V' stand for? Units?
Potential difference in volts, V
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What does 'I' stand for? Units?
Current in amps, A
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What do current potential difference graphs show?
How the current through a component varies with potential difference.
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What is Ohms Law?
The current through a resistor at a constant temperature is directly proportionsla to the potential difference across the resistor.
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## Other cards in this set

### Card 2

#### Front

Where are ammeters always placed?

#### Back

In series with the components.

### Card 3

#### Front

What does a voltmeter measure?

### Card 4

#### Front

Where are voltmeters always paced?

### Card 5

#### Front

What is the potential diiference, work done and charge equation?