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
Lu Ke Edition High School Physics Compulsory Course One
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
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
!["Electric Power" PPT courseware 5](https://resources2020.oss-cn-beijing.aliyuncs.com/resources2020/dc04368b6c80865243d24ccf50efaa5c.jpg)
Category | Format | Size |
---|---|---|
People's Education Edition Ninth Grade Physics Complete Book | pptx | 6 MB |
Description
"Electric Power" PPT courseware 5
Review and Reflection
1. What is the unit of electrical energy? What's the conversion relationship?
2. Instrument for measuring electrical energy – energy meter
So far, 823.6 kilowatt-hours of electricity have been consumed.
220V—Indicates that the rated voltage of this electric energy meter is 220V.
10 (20) A—Indicates that the maximum current allowed by this energy meter is 10A (cannot exceed 20A in a short period of time)
50Hz - Indicates that the energy meter is used in a 50Hz AC circuit
1500r/kW·h - means that for every 1kW·h of electric energy consumed, the energy meter's turntable rotates 1500 times
Observation experiment: Connect 60W and 25W light bulbs in parallel in the circuit to make them emit light normally and observe the brightness.
Conclusion: The aluminum disk of the electric energy meter rotates at different speeds, which means that the electrical appliances consume electricity at different speeds.
The faster the electric energy meter rotates, the faster (cannot say more) the electrical energy consumed by the electrical appliance; conversely, the slower the electrical energy consumed by the electrical appliance.
learning target
1. Know that electrical power is a physical quantity that indicates the speed of electrical energy consumption.
2. Know the concepts, formulas and units of electrical power.
3. Know the origin of the kilowatt-hour unit of electrical energy.
4. Know the rated power and rated voltage, and be able to distinguish between rated power and actual power.
5. Understand the relationship between electrical power, current, and voltage, and perform simple calculations.
1. Electric power
Read textbook P91-92 and answer the following questions:
1. Physical meaning: Indicates how fast the current does work. Or the speed of power consumption
2. Unit: watt, referred to as watt, symbol is W.
Commonly used units: kilowatt (KW), milliwatt (mW)
1 kW = 103 W
1 W = 103mW
3. Definition: The ratio of electrical power to time is called electrical power
It is numerically equal to the electrical energy consumed by electrical appliances per unit time.
2. The origin of “kilowatt-hour”
If the units of P and t are kW and h respectively, then after multiplying them, we get another unit of electrical energy: kilowatt-hour (degree).
1 kilowatt hour can be regarded as the electrical energy consumed by an electrical appliance with a power of 1 kW for 1 hour.
1 degree=1 kW·h = 1×103 W×3 600 s = 3.6×106 J
Note: kW · h and kW are units of two different physical quantities.
Kilowatt hour is the unit of electrical work and energy, while kilowatt and watt are the units of electrical power.
The difference and connection between electric power and electric power.
Electrical work refers to the work done by the current, and it can also indicate the amount of electrical energy consumed in the circuit.
Electrical power is equal to the ratio of electrical work to the time used, and is a physical quantity that indicates how quickly electrical energy is consumed.
3. Rated voltage and rated power
Rated voltage: The voltage at which an electrical appliance operates normally. "U amount"
Rated power: The power of an electrical appliance at rated voltage. "P amount"
Xiao Ming bought an incandescent lamp from the mall and looked carefully at its nameplate. It said "PZ220,25" on it. What does it mean?
Pz means general lighting, 220v is its rated voltage, 25W is its rated power
Actual voltage, actual power
Actual voltage: the voltage when the electrical appliance is actually working, "Ureal"
Actual power: the power of electrical appliances under actual voltage, "P real"
Summary: Electrical appliances can only work properly if they are used at rated voltage. The actual voltage is low, the power consumed by the electrical appliance is low, and it cannot work properly. The actual voltage is too high. Long-term use will affect the life of electrical appliances and may even burn out the electrical appliances.
practise
1. Regarding electric power, which of the following statements is correct ( )
A. The more electrical energy consumed by an electrical appliance, the greater the power.
B. The shorter the time the electrical energy is consumed by the electrical appliance, the greater the power.
C. The more electrical energy consumed by an electrical appliance, the longer it is used, and the greater the power.
D. At the same time, the more electrical energy consumed by an electrical appliance, the greater the power.
2. Xiao Ming studied in the evening and used a "220 40W" light bulb to work for 3 hours. The electric energy consumed in the circuit is ____kW·h. If there is a "600revs/kW·h" electric energy meter connected to the circuit, then in this paragraph The turntable of the electric energy meter rotates ____ times during the time.
3. There are three incandescent lamps. A is marked with "PZ220-15", B is marked with "PZ220-40", and C is marked with "PZ220-100". When they are connected to the household circuit, the lighting conditions during normal operation are ( )
A.Light A is the brightest B.Light B is the brightest
C. The C light is the brightest D. The same light
4. When a TV reporter talked about a factory that saved 5,000 kW·h of electricity in the first half of the year, he held up a hair dryer for hairdressing and said: "My hair dryer is 500 watts, which is 0.5 kilowatts. The electricity saved in this factory can run 10,000 of these hair dryers." Where did this reporter go wrong?
The reporter's statement confused the concepts of electrical energy and electrical power.
Keywords: Electric power teaching courseware, New People's Education Edition ninth-grade physics PPT courseware, ninth-grade physics slide courseware download, Electric power PPT courseware download, .ppt format
For more information about the "Electrical Power" PPT courseware, please click on the Electric Power ppt tab.
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 3:
"Exploring Joule's Law" Electric Energy and Electric Power PPT Courseware 3 1. Thermal Effect of Current: When electric current passes through a conductor, the conductor always generates heat. This phenomenon is called the thermal effect of electric current. 2. What factors are related to the thermal effect of current? Conjecture: 1. The heat of electric current...
"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..
File Info
Update Time: 2024-09-09
This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template
"Electric Power" PPT courseware 5 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Electric Power" PPT courseware 5 is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Electric Power" PPT courseware 5, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)
Preview
![《电功率》PPT课件5
(1)](https://resources2020.oss-cn-beijing.aliyuncs.com/resources2020/dc04368b6c80865243d24ccf50efaa5c.jpg)
![《电功率》PPT课件5
(2)](https://resources2020.oss-cn-beijing.aliyuncs.com/resources2020/64be226097241b404efc039b9985ab5a.jpg)