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

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Electromotive force and internal resistance
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What causes internal resistance in a battery?

Collisions between electrons and atoms

What does EMF (ε\varepsilon) represent?

Energy transferred per coulomb of charge

What is the formula for EMF in terms of energy (EE) and charge (QQ)?

ε=EQ\varepsilon = \frac{E}{Q}

How is total circuit resistance (RtR_t) calculated?

Rt=R+rR_t = R + r

What is the term for IRIR in the equation ε=IR+Ir\varepsilon = IR + Ir?

Terminal p.d.

What does 'lost volts' (vv) represent?

Energy lost inside the cell

How do you measure the EMF of a cell?

Voltmeter across cell in open circuit

Which equation relates EMF to terminal p.d. (VV) and lost volts (vv)?

ε=V+v\varepsilon = V + v

Why are there no lost volts when measuring EMF in an open circuit?

No current is flowing

A cell with EMF 66 V and terminal p.d. 55 V has what lost volts?

11 V

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