Calculating E.m.f (OCR AS Physics): Revision Note
Calculating E.m.f
The e.m.f ε is defined by the equation:

E.m.f can therefore be defined as the total, or maximum, voltage available to the circuit
Worked Example
A battery of e.m.f 7.3 V and internal resistance r of 0.3 Ω is connected in series with a resistor of resistance 9.5 Ω.

Determine:
a) The current in the circuit
b) Lost volts from the battery
Answer:

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