Electromotive Force & Potential Difference
This lesson covers:
- The definitions of electromotive force (emf) and potential difference
- The link between potential difference, energy, and charge
Electromotive force
Electromotive force (EMF) is defined as the energy supplied per unit charge, by a power source like a cell or battery.
EMF, measured in volts (V), drives the flow of charge around a circuit.
Potential difference
Potential difference is defined as the energy gained or lost per unit charge across a circuit component.
Potential difference is measured in volts (V).
Charges gains energy by passing through the power source.
Charges loses energy by passing through other electrical components.
The volt
The volt is defined as the energy per coulomb of charge.
V = E รท Q
1 Volt = 1 Joule per Coulomb
What is the definition of electromotive force (emf)?
The energy per coulomb of charge
The energy needed to remove 1 electron from each ion in 1 mole of gaseous ions
The energy gained or lost per unit charge across a circuit component
The energy supplied per unit charge
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What is the definition of potential difference?
The energy per coulomb of charge
The energy needed to remove 1 electron from each ion in 1 mole of gaseous ions
The energy supplied per unit charge
The energy gained or lost per unit charge across a circuit component
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What is the unit of measurement for potential difference?
Ampere (A)
Joule (J)
Watt (W)
Volt (V)
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