CAIE IGCSE Physics 4.3.3.3 Potential Divider Relation R1 R2 Questions

Practise using resistance ratios to divide supply voltage, calculate an unknown resistor or voltmeter reading and interpret sensor-based divider circuits.

Exam points

apply R1/R2 = V1/V2 to match resistors with measured p.d.
use Vout = Vsupply R/(R1 + R2) to calculate output or resistance
combine thermistor or LDR resistance with a fixed resistor

[Maximum number: 2]

Fig. 7.1 shows a circuit.

Fig. 7.1

Calculate the value of $V_{\text {out }}$ when the value of R is $3.0 \mathrm{k} \Omega$ .

V_{\text {out }}=

1.5 V
$V_{\text {out }} / V_{\mathrm{R}}=R_{\text {out }} / R$ oR $V_{\mathrm{R}}=3 V_{\text {out }}$

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CAIE IGCSE Physics 4.3.3.3 Potential Divider Relation R1 R2 Questions question 1