| Category | Format | Size |
|---|---|---|
| People's Education Edition Ninth Grade Physics Complete Book | pptx | 6 MB |
"Ohm's Law" PPT courseware 3
Description
"Ohm's Law" PPT courseware 3
Ohm's Law: The current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.
I ---- Current ---- Ampere (A)
U---- Voltage----Volt (V)
R----Resistance----Ohm (Ω)
(1) The units in the formula must be unified.
(2) Each physical quantity in the formula must correspond to the same circuit section.
Example 1
The headlights of a car are connected to both ends of the 12V power supply. The resistance of the filament is 30Ω. Find the current through the filament.
Solution: According to Ohm’s law
I=U/R=12V/30Ω=0.4A
Example 2
As shown in Figure 17.2-1, after the switch is closed, the voltmeter reads 6V and the ammeter reads 0.3A. Find the resistance of the resistor R.
Solution: According to Ohm’s law
R=U/I=6V/0.3A=20Ω
Example 3
The resistance of an iron is 0.1KΩ, and the current flowing through it during use is 2.1A. What is the voltage applied to the iron?
Solution: According to Ohm’s law
U=IR=2.1A×100Ω=210V
Do the math!
1. The resistance of an electric iron is 80Ω and it is connected to a voltage of 220V. What is the current flowing through it?
2. The resistance of a fixed-value resistor is 10 Ω, and the current flowing through it is 200mA. What is the voltage applied to both ends of the fixed-value resistor?
3. The voltage at both ends of a small light bulb is 2.5V when it is working. The current measured by an ammeter is 300mA. What is the resistance of this light bulb when it is working?
4. According to Ohm’s law formula I=U/R, R=U/I can be derived. Regarding this formula, the following statement is correct ( )
A. When the voltage across the conductor is zero, the resistance of the conductor is also zero.
B. The greater the voltage across the conductor, the greater the resistance of the conductor.
C. The greater the current in the conductor, the greater the resistance of the conductor.
D. The resistance of a conductor is the property of the conductor itself. Its size has nothing to do with the voltage at both ends of the conductor and the current in the conductor.
Keywords: Ohm's Law teaching courseware, New People's Education Edition ninth-grade physics PPT courseware, ninth-grade physics slide courseware download, Ohm's Law PPT courseware download, .ppt format
For more information about the "Ohm's Law" PPT courseware, please click the Ohm's Law ppt tag.
"Application of Ohm's Law" Exploring Ohm's Law PPT Courseware 3:
"Application of Ohm's Law" Exploring Ohm's Law PPT Courseware 3 1. Measure resistance by voltammetry 1. Principle: Ohm's law I=U/R deformation formula R=U/I 2. Equipment: power supply, switch, voltmeter, ammeter, sliding rheostat, small light bulb and some wires. 3. experiment..
"Application of Ohm's Law" Exploring Ohm's Law PPT Courseware 2:
"Application of Ohm's Law" Exploring Ohm's Law PPT Courseware 2 Learning Objectives 1. Learn to measure resistance using voltammetry. 2. Be able to use Ohm's law to analyze practical problems such as the hazards of short circuits. 3. By using Ohm's law measurement and analysis and discussion, we know that the resistance of the filament varies with...
"Application of Ohm's Law" explores Ohm's Law PPT courseware:
"Application of Ohm's Law" Exploring Ohm's Law PPT Courseware Teaching Objectives. 1. Know how to measure resistance by voltammetry. 2. Be able to analyze the hazards of short circuit. 3. Be able to use Ohm's law to perform simple calculations. There is a resistor with an unknown resistance in the laboratory. How to measure its resistance? ..
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Update Time: 2024-07-30
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