People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Beijing Normal University eighth grade physics volume one
Shanghai Science Edition 8th Grade Physics
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
Lu Ke Edition High School Physics Compulsory Course One
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
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Lu Jiao Edition Ninth Grade Physics Volume 1 | pptx | 6 MB |
Description
"Resistance" Voltage and Resistance PPT Courseware 2
The wires are mostly made of copper, and the wires of particularly important electrical equipment are also made of expensive silver. Iron is also a conductor. It is abundant and cheap. Think about it, why not use iron as a conductor?
Demo 1
Connect copper wires and nickel-chromium alloy wires of the same length and thickness to the circuit respectively, close the switch, and observe the brightness of the small bulb in the circuit.
Experimental phenomena
By connecting different conductors, the brightness of the small bulb changes.
Demo 2
In the above experiment, connect the ammeter, observe the changes in the ammeter's indication, and continue to observe the brightness of the small bulb.
Experimental phenomena
When the copper wire is connected to the circuit, the ammeter will read larger and the small bulb will be brighter;
When the nickel-chromium alloy wire is connected to the circuit, the ammeter indicates a smaller value and the small bulb becomes darker.
question
Under the same voltage, the current passing through the copper wire is larger than that of the nickel-chromium alloy wire. Why is there this difference?
Experimental phenomena
Although conductors easily conduct electricity, they also have a certain hindrance to current flow.
Under the same voltage, the current passing through the copper wire is relatively large, indicating that the copper wire has a relatively small obstruction to the current;
The current passing through the nichrome wire is relatively small, indicating that the nichrome wire has a relatively large obstruction effect on the current.
1. Resistance
1. In physics, resistance is used to represent the resistance of a conductor to current flow.
The greater the resistance of a conductor, the greater its resistance to current flow. The resistance of a conductor is usually represented by the letter R.
2. Unit: ohm (ohm), referred to as ohm, symbol Ω.
3. The units of resistance are also: megaohm (MΩ) kiloohm (kΩ)
The conversion relationship is:
1 kΩ = 1 000 Ω = 103 Ω
1 MΩ = 1 000 000 Ω = 106 Ω
4. Resistor
In electronic technology, we often use components with a certain resistance value - resistors, also called fixed-value resistors, or resistors for short. Symbols are used in circuit diagrams.
2. Explore the factors that affect the resistance size
Under the condition of certain materials, what other factors are related to the resistance?
Whether the size of the resistance is related to the length of the wire;
Whether the size of the resistance is related to the thickness of the wire;
other factors.
1. Explore the relationship between resistance and conductor length
2. Explore the relationship between resistance and conductor cross-sectional area
practice
1. A conductor is connected to a 3-volt power supply with a resistance of 10 ohms. If the conductor is removed from the circuit, the resistance of the conductor is _______ ohms.
Analysis: The resistance is 10 ohms, which is a property of the conductor itself. It has nothing to do with whether the conductor is connected in the circuit, whether there is voltage at both ends, or whether there is current in it.
2. Briefly answer the following questions:
(1) Why are the insulators of high-voltage lines (as shown in the picture) made of ceramic materials instead of glass?
(2) Iron is cheaper than copper. Why are copper wires used in household circuits instead of iron wires?
(3) Why can’t you operate electrical appliances with wet hands?
3. A and B are two identical wires, each with a length of 1 m. Cut A in half, and compare the remaining half with B. Which one has greater resistance? Stretch the remaining half of A to 1 m. Compared with B, which resistance is greater?
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Update Time: 2024-09-11
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