"Resistor" Voltage Resistance PPT Courseware 5

Description

"Resistor" Voltage Resistance PPT Courseware 5

discuss

1. What method can be used to display or explain that there is current flowing through the circuit?

Ammeter or small light bulb

2. Under what circumstances will current occur in the circuit?

access, power

What are the materials of the wires in the circuit?

Core: Copper

Jacket: rubber or plastic

Can the two materials be replaced? What is the reason?

Metals such as copper can conduct electricity, but materials such as rubber or plastic cannot

It shows that the conductive properties of different materials are different.

So how should we distinguish the conductivity of different substances?

summary

1. Conductor: A substance that easily conducts electricity.

Such as: metal (mercury), graphite, human body, earth and aqueous solution of salt, etc.

2. Insulator: A substance that does not conduct electricity easily.

Such as: rubber, glass, plastic, porcelain, dry wood, oil, dry air, pure water, etc.

3. Resistance (R)

Resistance is a physical quantity that measures the effect of a conductor on current flow.

The greater the resistance, the greater the conductor's resistance to current flow and the greater its conductivity.

Unit: ohm (Ω), referred to as ohm.

Units larger than ohms include kiloohms (kΩ) and megaohms (MΩ).

Relationship: 1MΩ= 103kΩ, lkΩ= 103Ω.

Practice in class

1. The reason why insulators are not easy to conduct electricity is because of the inside ( )

A. No charged particles B. Almost no electrons

C. There are very few free charges. D. There are a lot of free electrons.

2. The reason why conductors conduct electricity easily is ( )

A. Conductors are all solid

B. Conductors contain charges

C. A conductor contains charges that can move freely

D. The conductor is energized

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Update Time: 2024-11-24

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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