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ASPhysicsOCRRevision Notes4. Electrons, Waves & PhotonsEMF & Internal ResistanceCalculating E.m.f

Calculating E.m.f (OCR AS Physics): Revision Note

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Ashika

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Calculating E.m.f

  • The e.m.f ε is defined by the equation:

EMF equation, downloadable AS & A Level Physics revision notes

 

  • 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.

WE - internal resistance question image, downloadable AS & A Level Physics revision notes

Determine:

a) The current in the circuit

b) Lost volts from the battery

Answer:

Worked example internal resistance (2), downloadable AS & A Level Physics revision notes

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    Ashika

    Author: Ashika

    Expertise: Physics Project Lead

    Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.