| Category | Format | Size |
|---|---|---|
| Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 | pptx | 6 MB |
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 3
Description
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 3
1. Current heating effect:
When electric current passes through a conductor, the conductor always generates heat. This phenomenon is called the heating effect of electric current.
2. What factors are related to the thermal effect of current?
guess:
1. The thermal effect of current may be related to the size of the current
2. The heating effect of current may be related to the size of the resistor
3. The heating effect of current may be related to the length of power-on time
Joule's Law Mathematical Expression
W=Q
Q=I2RT
Review Electrical Power
1. The physical meaning of electrical power:
A physical quantity that represents how quickly an electric current does work
2. Definition of electric power:
The ratio of electrical power to the time it takes for the current to do work
3. Calculation formula of electric power:
P =W/t→P = UI→P =U²/R P = I²R
Example 1: What physical quantities can be known based on the light bulb nameplate mark "Pz220-40w"?
1. Rated voltage of the bulb: 220V.
2. Rated power of the bulb: 40w.
3. Rated current of the light bulb:
4. Resistance of light bulb:
Example 2: L1 "220 40w" and L2 "220V 100w" are connected in parallel on the 220V power supply. What is the actual power of each? Who is brighter? If connected in series to a 220V power supply, what is the actual power? Who is brighter?
Solution: When connected in parallel, the actual voltage is equal to the rated voltage, so the actual power is equal to the rated power. L2 is brighter.
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For more information about the "Electric Energy and Electric Power Exploring Joule's Law" PPT courseware, please click the Electric Energy and Electric Power ppt Exploring Joule's Law ppt tag.
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 2:
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 2 Learning Objectives: 1. Know the relationship between heat production, resistance and current of electrical appliances. 2. Be able to design experiments to verify the relationship between the heat generation of the resistor and current, voltage, and resistance, and be able to analyze the experimental data to obtain...
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware:
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware [Learning Objectives] 1. Know the thermal effect of electric current and its application and control in practice. 2. Through experiments, explore the factors related to the heat released by energized conductors. In the process of designing experiments, control variables are used..
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Update Time: 2024-07-31
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