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Electromotive Force and Internal Resistance
Physics
Question
Electromotive Force and Internal Resistance
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Electromotive force (e.m.f)
The energy per unit charge converted from the other forms of energy into electrical energy to move the charge across the whole circuit
E.m.f formula
Unit for e.m.f
Volt (V)
In circuit, cell is the device....
......that supplies e.m.f
Internal Resistance
Resistance against the moving charge in the source
Load Resistance
The effective resistance against the moving charge outside the source of electric
Terminal Potential Difference
Potential difference across the two terminals of an electric source
The relationship between e.m.f. and the terminal potential difference
E=IR+Ir
In open circuit ( when the switch is off).....
.....the voltmeter shows the reading of the e.m.f
In close circuit ( when the switch is on)....
.....the voltmeter shows the reading of the potential difference across the cell
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Electromotive Force and Internal Resistance
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