⚡ Welcome to another electronics quiz by MY CREATIVE ENGINEERING!
Relays are widely used in electronics, electrical control panels and industrial automation. But do you know how to identify the three important relay terminals: NO, NC and COM?
Test Your Electronics Knowledge!
Look at the relay diagram in the quiz image and identify the correct terminal connections.
What do NO, NC and COM mean?
- NO (Normally Open): The contact is open when the relay coil is not energised.
- NC (Normally Closed): The contact is closed when the relay coil is not energised.
- COM (Common): The common moving contact that switches between NO and NC.
Your Challenge
 |
NO, NC and COM terminals on a relay. |
A, B, C or D?
💬 Leave your answer in the comments below. Let's see how many people can get it right!
Why Is This Important?
Understanding relay terminals is essential when working with:
- Arduino and microcontroller projects
- PLC control systems
- Automatic switching circuits
- Motor control panels
- Home automation projects
- Industrial electrical control systems
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Note: Relay terminal numbering and physical pin positions vary between relay models. Always refer to the manufacturer's datasheet before making electrical connections.
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