CAIE A-Level Physics AS 10.1.3 The Electromotive Force E M F of a Source As Energy Transferred Per Unit Questions

Define electromotive force as energy transferred per unit charge by a source.

Exam points

Define electromotive force as energy transferred per unit charge by a source.

[Maximum number: 3]

A battery of electromotive force (e.m.f.) 6.0 V and internal resistance r is connected to a resistor of resistance $12 \Omega$ and a variable resistor X, as shown in Fig. 6.2.

Fig. 6.2

A charge of 2.5 kC passes through the battery.

Calculate
1. the total energy transformed by the battery,
energy = J
2. the number of electrons that pass through the battery.
number =

1

Energy = EQ
$\begin{aligned} =6.0 \times 2.5 \times 10^{3} =1.5 \times 10^{4} \mathrm{~J} \end{aligned}$
6(b)(ii)2

$\begin{aligned} \text { number } =2.5 \times 10^{3} / 1.6 \times 10^{-19} =1.6 \times 10^{22}\left(1.56 \times 10^{22}\right) \end{aligned}$

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CAIE A-Level Physics AS 10.1.3 The Electromotive Force E M F of a Source As Energy Transferred Per Unit Questions question 1