"Electric Energy and Electric Power" Electric Energy and Electric Power PPT Courseware

Description

"Electric Energy and Electric Power" Electric Energy and Electric Power PPT Courseware

【learning target】

1. Know electrical energy, understand the concept of electrical power, and know the units of electrical power.

2. Understand the electric energy meter, understand the meaning of the electric energy meter parameters, and be able to read the electric energy meter.

3. Through analyzing examples, establish and understand the concept of electrical power from the perspective of energy conversion.

4. Understand the application value of electric energy and have the awareness to save electric energy.

Core test points: The reading of the electric energy meter and the meaning of each parameter in the electric energy meter, and the calculation of electric energy.

【Preview before class】

1. The process of current doing work is actually the process of converting ______ energy into ____________ energy; as much work as the current does, how much electrical energy is converted into other forms of energy, and how much electrical energy is consumed

2. Measurement of electrical power: ______ is an instrument used to measure electrical power, that is, to record the electrical energy consumed by a circuit.

3. The basis for the monthly electricity bill that household users should pay is ()

A． How much electrical appliances are used b. The size of the electrical power used

C． How much electrical energy is consumed D. The size of the current passing through the electrical appliance

[Intensive lectures in class]

Knowledge point 1. Electric energy and electric power

(1) The utilization of electrical energy is the main symbol of the second industrial revolution. Since then, human society has entered the electrical age. The utilization of electrical energy is achieved by converting electrical energy into other forms of energy, such as: light energy, thermal energy, kinetic energy, etc. .

(2) In physics, when electrical energy is converted into other forms of energy, we say that the current has done electrical work. The amount of electrical energy converted into other forms of energy can be measured by the size of the electrical work. Electrical work is represented by the letter W. , the unit of electrical power is the same as the unit of mechanical work, which is joule (J). The unit of electrical power in daily life is commonly kilowatt-hour (commonly known as "degree"), and the symbol is kW·h.

(3) The difference and connection between electric power and electric energy

① Difference: Electrical energy reflects the ability of electric current to do work. It is similar to mechanical energy and internal energy and is a form of energy in nature. Electrical work indicates how much electrical energy is converted into other forms of energy during the process of electric current doing work. Therefore, electrical energy is a state quantity and electrical work is a process quantity.

②Contact: How much electrical energy is converted into other forms of energy can be measured by the size of the electrical work. How much work the current does is how much electrical energy is converted into other forms of energy. They are equivalent, so the unit of electrical work is the same as The unit of electrical energy is the same, Joule.

[Example 2] (2014·Huaian) As shown in the figure, it is a schematic diagram of an inductive electric energy meter. The correct statement related to its technical parameters is ()

A． Rated power during normal operation is 220V

B. The power consumption of the circuit is 1kW·h for every 2 revolutions

C． Maximum current for normal operation is 10A

D. The electrical energy consumed by the circuit is 2 486kW·h

[Exercise 2] (2014·Guang'an) One day, Xiaohong looked at the dial of her home electric energy meter as shown in the picture. At this time, the reading of the electric energy meter was _______kW·h; every time the dial of the electric energy meter rotates 300 times, it means that Xiaohong The electrical appliances at home consume _______kW·h of electricity.

[Exercise 3] (2014•Qingyang) An electric energy meter is marked with “720revs/(kW•h)” on the dial, which means ____________________. The electric energy indicators of Xiao Ming's home before and after one week are shown in the figure. The electricity bill per kilowatt hour of electricity in the area where Xiao Ming's home is located is 0.6 yuan. Then Xiao Ming's home consumes a total of _______kW·h this week, and it is estimated that his home will need to pay _______ for 4 weeks. Yuan electricity bill.

In-class testing

1. In household circuits, electric energy meters can directly measure ( )

A． Electric power b. Resistor C． Electric current D. Voltage

2. (2014•Putian) The international unit of electrical power is ( )

A． Volt (V) B. Ampere (A)

C． Watt (W) D. Joule (J)

3. As shown in the figure, when the following electrical equipment is working, it mainly converts electrical energy into internal energy ( )

A． TV set b. Washing machine c. Electric fan D. electric kettle

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For more information about the "Electric Energy and Electric Power Electric Energy and Electric Power" PPT courseware, please click the Electric Energy and Electric Power ppt Electric Energy and Electric Power ppt tab.

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Update Time: 2024-07-06

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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