Electromotive force and internal resistance (AQA A-Level Physics): Flashcards

Collisions between electrons and atoms inside the battery

$r$

Energy transferred per coulomb of charge by a cell

$\varepsilon$

$\varepsilon = \frac{E}{Q}$

$R_t = R + r$

$\varepsilon = IR + Ir$

$V = IR$ (p.d. across load resistance)

$v = Ir$ (energy lost inside cell)

Voltmeter across cell in open circuit (no current)