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CAIE A-Level Physics Circuit Symbols Used in Examinations

Practise recognising official symbols for supplies, switches, resistors, sensors, meters, diodes and other input or output components in CAIE Physics diagrams.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • identify the official circuit symbols for common components such as LEDs, diodes, thermistors and sound transducers
  • select or interpret circuit symbols when matching components to their electrical or output function

C.1-Circuit symbols used in examination papers question 1

[Maximum number: 3]

A circuit incorporating an ideal operational amplifier (op-amp) is shown in Fig. 7.1.

Fig. 7.1

Fig. 7.1

The variation with temperature θ\theta of the resistance RTR_{\mathrm{T}} of the thermistor is shown in Fig. 7.2.

Fig. 7.2

Fig. 7.2

The output of the op-amp is to be displayed using two light-emitting diodes (LEDs) labelled G and B.
When the temperature of the thermistor is below 4.0∘C4.0^{\circ} \mathrm{C}, only the LED labelled G emits light. The LED labelled B emits light only when the temperature of the thermistor is above 4.0∘C4.0^{\circ} \mathrm{C}.

On Fig. 7.1, draw and label the symbols for the two LEDs.

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