CAIE IGCSE Physics 4.3.2.3 Combined E M F of Several Sources in Questions

Learn to add identical cell voltages in series and determine the number of cells needed.

Exam points

calculate total e.m.f. by adding cell voltages in series
determine the number of identical cells from battery and cell e.m.f.
distinguish series cell addition from parallel arrangements

[Maximum number: 1]

Fig. 8.2 shows a circuit.

Fig. 8.2

The three cells are identical and have zero resistance.
The resistors $R_{1}, R_{2}$ and $R_{3}$ are identical.
The reading on the voltmeter is 6.0 V .
When the diode is conducting, it has zero resistance and zero potential difference (p.d.) across it.

Determine the e.m.f. of one cell.

e.m.f. =

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CAIE IGCSE Physics 4.3.2.3 Combined E M F of Several Sources in Questions question 1