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EMF, terminal p.d. and real cells

EMF, terminal p.d. and real cells

Circuit model of a real cell with emf, internal resistance and load resistor beside a graph of terminal p.d. against current with y-intercept labelled epsilon and gradient labelled minus r

EMF is the energy supplied per unit charge by a source, so ε=WQ\varepsilon = \frac{W}{Q}ε=QW​. It is measured in volts because 1 V=1 J/C1 \, \text{V} = 1 \, \text{J/C}1V=1J/C, but it is not a force.

EMF and internal resistance Lesson

  1. A Level
  2. /Physics
  3. /EMF and internal resistance

Step-by-step lessons covering Edexcel A Level Physics EMF and internal resistance for A Level Physics. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Physics is one of the most mathematically demanding A Levels -- at least 40% of the marks across the three papers require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

Lessons