"Charge and Current" PPT courseware

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"Charge and Current" PPT courseware

Part One: Do it and think about it

Ask students to rub a plastic pen or plastic comb vigorously on their hair or clothes, and then move closer to the scraps of paper.

Phenomenon seen: Rubbed plastic ruler attracts paper scraps.

What is this phenomenon?

Friction electrification.

What other phenomenon is frictional electrification?

Combing your hair with a comb, taking off your sweater at night in winter

What happens to objects that have been rubbed?

Attracts light and small objects.

Charge and current PPT, part 2: charge

1. Frictional electrification:

1) Electric charge: A rubbed object can attract light and small objects. We say that the object is charged, or charged.

2) Triboelectricity: The phenomenon that a rubbed object can attract light and small objects is called triboelectricity.

3) Common frictional electrification phenomena:

Charge and current PPT, part 3: causes of frictional electrification:

Different substances have different abilities to bind electrons to atoms.

When two objects rub against each other, electrons are transferred from the object with a weak ability of the atomic nucleus to bind electrons to an object with a strong ability of the atomic nucleus to bind electrons. Objects that have lost electrons are positively charged, and objects that have gained electrons are negatively charged.

The essence of triboelectricity is that electricity is not created, but electrons are transferred.

Charge and current PPT, Part 4: Requirements for drawing circuit diagrams

1. The components should be arranged appropriately and evenly distributed. Components should not be drawn at the corners; the corners should be at right angles.

2. The entire circuit diagram should preferably be in a rectangular shape with edges and corners;

3. When drawing circuit diagrams, use a ruler to ensure that the wires are horizontally and vertically;

4. Draw with pencil and easy to modify.

Charge and current PPT, Part 5: Circuit connection:

Divided into series circuit and parallel circuit

If you were given another small light bulb, could you connect it to a circuit so that it could also emit light? The method is not limited, but the corresponding circuit diagram must be drawn according to the connected circuit.

A circuit that connects electrical appliances one by one. There is only one path for current to flow.

A circuit that connects electrical appliances in parallel. There are multiple current paths (including main paths and branches)

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, charge and current PPT download, .PPT format;

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"Charge and Current" PPT:

"Charge and Current" PPT Part One: Introduction to Life Have you ever seen the occurrence of static electricity in your life? Static electricity is discharged when dressing in dry weather in winter. Static electricity is discharged by touching metal with dry hands. Rub a plastic pen (or ruler) with your hair, and then move it close to a small piece of paper.

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Update Time: 2024-07-06

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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