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Relays, LDRs and Thermistors

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A series of free GCSE/IGCSE Physics Notes and Lessons.

Relays, LDRs and Thermistors

In this lesson, we will learn about components like LDRs, thermistors and diodes, and their use in relays and rectifiers.

LDRs, thermistors and diodes, and their use in relays and rectifiers
Suitable for IGCSE and GCSE revision.



Logic Gates and Relay Circuits
OCR Gateway P6 Q15 - GCSE Physics Revision

How to protect circuit boards from high currents by separating parts of circuits using a relay switch. This means a second circuit with low current which operates the circuit with the higher current.

Bill has a programmable washing machine.
A combination of logic gates controls the motor in the washing machine.
The motor in the washing machine runs on a 230 V mains voltage.
He draws a diagram to show how the circuits in the washing machine should be connected.
Look at the diagram.
Connecting the washing machine as shown in the diagram will not work.
Explain why and how the circuits should be connected.

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