"Magnetic Force of Electromagnets (1)" Energy PPT Download

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"Magnetic Force of Electromagnets (1)" Energy PPT Download

Part 1: Importing new lessons

How can we carry these heavy objects easily?

What factors are related to the magnetic force of the electromagnet?

The electromagnetic crane has a strong electromagnet, which can pick up scrap steel when it is powered on. When the current is cut off when moving to another place, the scrap steel will automatically fall down.

Magnetic force of electromagnets PPT, part 2: exploring new knowledge

make our assumptions

Our hypothesis on “What factors are related to the magnetic force of electromagnets?”

Our hypothesis

1. The magnetic force of the electromagnet is related to the number of coil turns. Increasing the number of coil turns will increase the magnetic force; decreasing the number of coil turns, the magnetic force will decrease.

Magnetism is produced by a coil of electricity.

2. It is related to the current. If there are few batteries, the magnetic force will be small. If there are many batteries, the magnetic force will be strong.

Magnetism is produced by passing electricity through a coil of wire.

Design experiments to test hypotheses

Questions to think about:

This experiment is a comparative experiment. What conditions need to be changed? What conditions should be controlled unchanged? How can these conditions be changed or not changed?

What we found:

The magnetic force of the electromagnet is related to the number of coil turns. The more coil turns, the greater the magnetic force. The fewer the coil turns, the smaller the magnetic force.

The magnetic force of electromagnets PPT, the third part: expansion and extension

There are two main factors that affect the magnetic force of an electromagnet. One is the number of turns of the coil wound on the iron core; the other is the intensity of the current in the coil.

Since the beginning of the 20th century, the theoretical research and application of electromagnetic waves have developed rapidly, making them the best carrier and important medium for battlefield information acquisition, transmission, processing and confrontation.

Magnetic force of electromagnets PPT, Part 4 content: Class summary

The magnetic force of the electromagnet can be changed. The magnetic force of the electromagnet is related to the number of coil turns. A small number of coil turns means a small magnetic force, and a large number of coil turns means a strong magnetic force.

Magnetic force of electromagnets PPT, part 5: exercises for this lesson

1. Judgment questions

1. The magnetic force of the electromagnet has nothing to do with the number of turns of the coil. ( )

2. An electromagnet is a device that uses electric current to generate magnetic force. ( )

3. In order to save materials, you can use a long wire to wind three electromagnets with different numbers of turns. ( )

2. Fill in the blanks

1. Use ( ) to test the hypothesis of the magnetic force of the electromagnet.

2. Magnetism is produced by ( ).

3. The magnetic force of the electromagnet is related to ( ).

4. The theoretical research and application of ( ) are developing rapidly, making it widely used.

Magnetic force of electromagnets PPT, Part 6: Homework

Go home and continue your research. What other factors affect the magnetic force of electromagnets?

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"Magnetic Force of Electromagnets (2)" Energy PPT Download:

"Magnetic Force of Electromagnets (2)" Energy PPT Download Part One: Review Introduction An electromagnet is a device composed of a coil and an iron core. The magnetic force of the electromagnet is related to the number of coil turns: the greater the number of coil turns, the greater the magnetic force, and the smaller the number of coil turns..

"Magnetic Force of Electromagnets (2)" Energy PPT:

"Magnetic Force of Electromagnets (2)" Energy PPT Part One Content: The group tests the selected hypothesis and formulates a group research plan. What are the factors we want to examine (i.e. the conditions that need to be changed)? How to change this condition? For the sake of fairness in the experiment, it should be controlled...

"Magnetic Force of Electromagnets (1)" Energy PPT Teaching Courseware:

"The Magnetic Force of Electromagnets (1)" Energy PPT Teaching Courseware Part One: Introduction of the new lesson Why the magnetic force of electromagnets is different and what factors affect the magnetic force of electromagnets. In today's lesson we will learn about the magnetic force of electromagnets. ... ... ... electromagnetism..

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Update Time: 2024-09-30

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