The Magic of Electromagnets: Uses and Working Principles

Discover the fascinating world of electromagnets, from their uses in everyday objects like doorbells and electric motors to how they work to create magnetic fields when electrical currents flow through wires. Explore the risks associated with using electromagnets and the wonders of how they power devices like electromagnetic door locks and scrap metal magnets.

• Electromagnets
• Magnetic Fields
• Electric Motors
• Doorbells
• Technology

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Uploaded on Jul 22, 2024 | 3 Views

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Presentation Transcript

1. Monday 10thMay 2021 Uses of electromagnets Keyword Challenge Your challenge is to make as many words as you can from today s keyword. electromagnet 10 words or more 8 words or more 6 words or more

2. State 2 uses of regular magnets What risks com with using electromagnets? State 2 uses of electromagnets

3. Electromagnets When electrical charges flow in a wire, a magnetic field is formed around the wire. The larger the current, the stronger the magnetic field will be. When a current stops flowing, there is no magnetic field.

4. Uses of Electromagnets Electromagnets are used for many different things. ? Can you think how electromagnets may be used in each of the objects below? digger with magnet and scrap metal electromagnetic door lock doorbell electric motor

5. How Do They Work? When the button of a doorbell is pushed, it acts as a switch and closes an electrical circuit. The electromagnet inside becomes active, and attracts a small metal arm towards it. As soon as the arm moves, the circuit breaks, so the arm is no longer attracted to the magnet and falls back down, hitting a small metal plate. The sound of the metal arm repeatedly and rapidly hitting the metal plate causes the buzzing sound of the doorbell. This is also how electric school bells work!

6. How Do They Work? The scrap metal magnet makes use of the fact that electromagnets can be switched on and off. The magnet is activated to attract the scrap metal from one place and carry it to another. Then, the magnet can be switched off, releasing the metal so that it drops into its new location.

7. How Do They Work? Electric motors convert electrical energy into movement energy. When the electromagnet inside a motor is switched on, its north pole is attracted to another magnet. However, at the same time, its south pole is repelled by another magnet. This causes the electromagnet to turn. This continues to happen, so the electromagnet keeps rotating as it is attracted and repelled. This spinning movement is what powers the motor.

8. How Do They Work? An electromagnetic door lock consists of an electromagnet fitted to the door frame, and a metal plate attached to the door. When the electromagnet is switched on, the metal plate on the door is attracted to it. The force between the electromagnet and the metal plate is strong enough to hold the door closed.

9. Create a minimum of 2 paragraphs to describe the uses of electromagnets in every day life. Use the examples in the video or on the slides. You can use the sentence starters and the keywords if you need help getting started. Electromagnets are magnets that are formed by Electromagnets can be useful for This works by Another use for electromagnets is This works by An advantage of electromagnets over normal magnets is Keywords: coil, iron core, electrical current, magnetic, doorbell, scrapyard crane, motor, electromagnetic lock, on and off.

10. True or false? - Steel and iron are magnetic. - All magnets have a north and south pole. - Electromagnets can t be turned on or off. - Electromagnets are used in scrapyards. - A solenoid that has an iron core is not an electromagnet. - To increase the strength of on electromagnet less coils could be used.