"Magnetic Force of Electromagnets" PPT

Description

Hunan Education Edition fifth grade science volume 2, magnetic force of electromagnet PPT courseware

Part One: Experiment

Experiment 1: The relationship between the magnetic force of an electromagnet and the intensity of the current

experiment plan

Research question: How to make the electromagnet's magnetic force stronger?

My guess: The magnetic force of the electromagnet is related to the number of cells in the battery.

Experimental equipment: insulated wires, nails, three batteries, a box of paper clips

Experimental steps:

1. Make an electromagnet and note the number of turns of the wire around the iron nail (remain unchanged)

2. Connect a battery to the electromagnet circuit and note the maximum number of pins it can hold.

3. Connect two batteries to the same electromagnet circuit and note the maximum number of pins it can absorb.

Magnetic force of electromagnet PPT, part 2 content: Warm reminder

Kind tips

1. Repeat experiments many times and keep records

2. Do not turn on the electromagnet for a long time to avoid excessive battery consumption and affecting the accuracy of the experiment.

3. Use nail caps to suck pins uniformly

Experimental results:

The magnetic force of the electromagnet is related to the number of batteries connected in series.

The stronger the current passing through the coil, the stronger the magnetic force;

If the current passing through the coil is weak, the magnetic force will be small.

Experiment 2: Explore the relationship between the magnetic force of the electromagnet and the number of turns of the coil

Experiment records

1. Change the magnetic force of the electromagnet. What are the factors that affect the magnetic force of an electromagnet?

Guess 1

The magnetic force of the electromagnet is related to the number of battery cells.

Guess 2

The magnetic force of the electromagnet is related to the number of turns of the coil.

Magnetic force of electromagnets PPT, Part 3: Research questions

Research question: How to make an electromagnet stronger?

My guess: The magnetic force of the electromagnet is related to the number of turns of the coil.

Experimental materials: insulated wires, nails, a battery, a box of paper clips

Experimental steps:

1. Make two electromagnets, one with 50 turns and the other with 100 turns.

2. Connect two electromagnets to the circuit of a battery respectively, and record the maximum number of paper clips they can absorb.

Magnetic force of electromagnets PPT, part 4 content: multiple choice questions

Multiple choice questions

1. The following ( ) will not affect the change of the magnetic force of the electromagnet.

A Increase or decrease the number of batteries B Change the winding direction of the coil

C Change the connection between the positive and negative poles of the battery D Increase or decrease the number of turns of the coil

2. When you don’t know what factors are related to the magnetic force of the electromagnet, use comparative experiments to study whether the magnetic force of the electromagnet is related to the number of batteries in the circuit. You should control ( ) to be the same

A. The number of turns of the electromagnet coil B. The thickness of the iron core

C. Thickness of insulated wire

D. Number of batteries

3. In designing comparative experiments, in order to study whether a certain factor will have an impact on the comparative experimental results, we should ( ).

A. Control one condition to be the same and other conditions to be different.

B. Control one condition to be different and other conditions to be the same.

C. Control the two conditions to be different and other conditions to be the same.

4. If you need to make an electromagnet with relatively large magnetic force, you should ( )

A. Wind as many coils as possible

B. Increase the current in the electromagnet coil

C. Use the above two methods at the same time

D. Make the iron core thicker

Magnetic Force of Electromagnets PPT, Part 5: Experimental Questions

4. Experimental questions

The picture below is a comparative experiment to study whether the magnetic force of the electromagnet is related to ( ).

The conditions that do not need to be changed in the experiment are: the number of battery cells and the thickness of the iron core

The conditions that need to be changed in the experiment are: the number of coil turns

Conclusion of the experiment: The magnetic force of the electromagnet is related to the number of turns of the coil. And the more turns, the stronger the magnetic force.

experiment plan:

Ask a question: Does the thickness of the electromagnet core affect the magnitude of the magnetic force?

Guess: The magnetic force of the electromagnet is related to the thickness of the iron core.

Experimental equipment: 2 wires with insulation, 2 iron nails, a battery, a box of paper clips

Method steps:

1. Use two iron nails with diameters of 0.2 cm and 0.5 cm of the same length, and two thin wires with insulation layers of the same thickness and length to make two electromagnets with the same number of turns.

2. Connect two electromagnets to the same circuit, and note the maximum number of paper clips it can hold.

Keywords: Hunan Education Edition fifth grade science PPT courseware for the second volume free download, magnetic force of electromagnet PPT download, .PPT format;

For more information about the PPT courseware "Magnetic Force of Electromagnets", please click on the Magnetic Force of Electromagnets ppt tab.

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Update Time: 2024-11-21

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