Notes
Current Electricity: Voltage
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Potential Difference (Voltage)
Work done in moving a charge of 1 coulomb from one point to another
Scalar quantity
Unit = Volt
V = W/Q
V = voltage
W = work
Q = charge
Potential
When two charges are very far apart, there is no force between them and they are said to be at zero potential
We take the Earth to be our zero potential
The potential difference between a point and the earth is called the potential of that point
When a conductor is earthed, this means that its potential is brought to zero
Voltmeter
Measures voltage
Connected in parallel with the component that it is measuring
Electromotive force
emf
A voltage that is applied to a circuit
Sources of emf
A device in which any form of energy is converted to electrical energy
Battery
Electric generator
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- This note covers voltage (or potential difference). Topics include the formula for potential difference, the concept of potential, measuring potential difference and electromotive force. It is aimed at a leaving certificate student or someone who has an interest in voltage.
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