A-Level Physics OCR A H556

4.3.2: Internal resistance

#4.3.2a

source of e.m.f.; internal resistance

#4.3.2b

terminal p.d.; 'lost volts'

#4.3.2c

(i) the equations $ε = I(R + r)$ and $ε = V + Ir$

(ii) techniques and procedures used to determine the internal resistance of a chemical cell or other source of e.m.f.

PAG4

4.3.1

Series and parallel circuits

4.3.3

Potential dividers

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