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"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 2
Observe and think
The inside of the wire is a metal wire and the outside is covered with a layer of plastic or rubber. Why is this?
Experimental exploration:
Connect a steel ruler, wooden stick, rubber, glass and salt water between points A and B respectively, close the switch, and observe the display of the ammeter and the brightness of the small bulb.
in conclusion:
When __________ is connected to a circuit, there is current in the circuit, indicating that these objects easily conduct electricity, so we call them conductors.
When __________ is connected to a circuit, there is no current in the circuit, indicating that these objects I are not easy to conduct electricity. We call them insulators.
1. Lead wire, plastic, air, human body, which ones are conductors and which ones are insulators? How do you judge?
2. Can you tell which substances are conductors and which substances are insulators?
small exercise
1. The main difference between conductors and insulators is:
There is ______________ in the conductor,
And inside the insulator _______________.
2. _______________ is called a conductor, such as: ______, ______, ________, ______, ______
3. __________________ is called an insulator, such as: ______, ______, ________, ______
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"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 6:
"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 6 Project Main Content Conductor Definition ________ object. Such as metals, aqueous solutions of various acid and alkali salts, the human body, and the earth. Reasons for conductivity: Conductors conduct electricity easily because there are a large number of _______ charges in the conductors.
"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 5:
"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 5 Short Story: During the Kosovo War, a NATO spokesperson boasted about having a power switch that controlled Yugoslavia. On the evening of May 2, 1999, the U.S. Air Force used a mysterious weapon (graphite bomb) when bombing Yugoslavia...
"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 4:
"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 4 Guess which materials are metal wires, plastic rulers, glass rods, pencil leads (carbon rods), salt water, chalk, and coins, which are easy to conduct electricity? Which substances do not conduct electricity easily? Circuit Exploration: The Conductivity of Materials..