Electromagnets, electric motors & transformers

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What is an electromagnet?

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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It consists of a coil of wire, often wrapped around a core of ferromagnetic material.

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NGSS.MS-PS2-5

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What is magnetism?

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Magnetism is a force that can attract or repel certain materials, such as iron and steel. It is produced by the motion of electric charges.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

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What is an electric motor?

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An electric motor is a device that converts electrical energy into mechanical energy, allowing it to perform work, such as turning a fan or driving a car.

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NGSS.MS-PS3-5

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What materials can a magnet pick up?

Back

A magnet can pick up objects made of iron or steel.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

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How can you increase the strength of an electromagnet?

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You can increase the strength of an electromagnet by increasing the number of coils around the core, increasing the current flowing through the wire, or using a larger core.

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What is the role of coils in an electromagnet?

Back

Coils of wire create a magnetic field when an electric current passes through them. The more coils, the stronger the magnetic field.

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What is the difference between a permanent magnet and an electromagnet?

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A permanent magnet produces a constant magnetic field without the need for electricity, while an electromagnet's magnetic field can be turned on and off with an electric current.

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What is electric current?

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Electric current is the flow of electric charge, typically measured in amperes (A). It is the movement of electrons through a conductor.

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What is a transformer?

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A transformer is a device that changes the voltage of an electric current, allowing it to be increased or decreased for transmission or use.

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What is the function of a transformer in electrical systems?

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Transformers are used to increase or decrease voltage levels in electrical systems, making it safer and more efficient to transmit electricity over long distances.