"Electric Energy, Electric Power" Electric Power PPT Teaching Courseware

"Electric Energy, Electric Power" Electric Power PPT Teaching Courseware

Part One: Knowledge Management

1. Electric energy

Produces: thermal power generation, hydropower generation, wind power generation, solar power generation, etc.

Unit: joule (J); kilowatt hour (kW·h), also known as degree, 1 kW·h = 3.6×106J.

2. Meter

Function: Measure the electrical energy consumed by electrical appliances within a period of time.

Parameters: (1) "220 V" means that this energy meter should be used in a circuit with a voltage of 220 V.

(2) “10(20) A” means that the calibrated current of this electric energy meter is 10 A and the rated maximum current is 20 A. The current when the electric energy meter is working should not exceed the rated maximum current.

(3) 600 revs/(kW·h) refers to the electrical appliance connected to this electric energy meter. For every 1 kW·h of electric energy consumed, the turntable on the electric energy meter rotates 600 times.

Reading: The difference between the two readings on the energy meter counter is the amount of electricity used by the user during this period. Note that the last digit is a decimal.

Electric energy and power PPT, the second part of the content: classification and exploration

Type One: Understanding of Electric Energy and Electric Power

[2018•Hunan Xiangxi Prefecture]Among the household appliances listed below, during normal operation, electrical energy is mainly converted into mechanical energy (　A　)

[Analysis] Among common household appliances, electric fans mainly convert electrical energy into mechanical energy; electric kettles and rice cookers mainly convert electrical energy into internal energy; TVs mainly convert electrical energy into light energy and sound energy.

[Summary] The process of current doing work is essentially the process of converting electrical energy into other forms of energy. Electrical appliances consume electrical energy and obtain other forms of energy, which is a process of current doing work.

Type 2: Electric energy meter measures electrical energy

[2019•Wuhu, Anhui]Xiao Ming observed the electric energy meter in his home as shown in the picture. The following statement is correct (B)

A． This electric energy meter should be used in a circuit less than 220 V

B． The short-term working current of the electric energy meter cannot exceed 20 A

C. Xiao Ming’s home has consumed 107 kW·h of electricity this month.

D. This electric energy meter turntable rotates 3,000 times per hour

[Analysis] This electric energy meter should be connected to a 220 V circuit, so statement A is wrong; from "10(20)A" we can see that the current when this electric energy meter is working does not exceed 20 A, so statement B is correct; Xiao Mingjia The electric energy consumed after being connected to the electric energy meter is 107.0 kW·h, which is not the electric energy consumed this month, so statement C is wrong; "3 000 r/(kW·h)" means that for every 1 kW·h of electric energy consumed, the electric energy meter The turntable of the electric energy meter rotates 3,000 times per hour, not the electric energy meter turntable turns 3,000 times per hour, so D’s statement is wrong.

Electric energy and power PPT, the third part: evaluation in class

1. [2018•Shandong Jinan]Xiaoliang wants to measure the power consumed by the TV at home in standby mode. The instrument he needs to choose is (　C　)

A． Ammeter b. Voltmeter

C. Electric energy meter D. rheostat

2. [2018•Qingdao, Shandong]The current when a voltage of 2.5 V is applied to both ends of a small light bulb is 0.3 A, then the power consumed by it when it is powered for 2 minutes is (　C　)

A． 0.025 kW·h B. 2.5 kW·h

C. 90JD. 1.5 J

3. [2018•Qinghai]In the circuit shown in the figure, the power supply voltage remains unchanged, only switch S1 is closed, and the ammeter indicates 0.3 A. Then switch S2 is closed, and the current indication changes by 0.4 A. , then after closing S1 and S2 at the same time, the ratio of the electric energy consumed by R1 and R2 in the same time is (　A　)

A． 3:4 B． 4:3

C. 7:3 D. 4:7

4. [2018•Xi’an, Shaanxi]The pictures show the electric energy meter dial of Xiao Ming’s family at the beginning and end of last month respectively. Which of the following statements is correct (A)

A． The current in Xiaoming's main circuit must not exceed 20 A

B． The electricity consumed by Xiao Ming’s home last month was 91.1 kW

C. If the electricity price is 0.5 yuan/kWh, the electricity bill Xiao Ming’s family should pay last month was 59 yuan.

D. Within a certain period of time, if the indicator light flashes 32 times, 7 200 J of electric energy is consumed in the circuit.

Electric energy and power PPT, part 4: layered operations

1. [2017•Jiangsu Yangzhou]When the following electrical appliances are working, all electrical energy is converted into internal energy (B)

[Analysis] The electric fan converts electrical energy into mechanical energy and internal energy, so A is wrong; the electric kettle converts all electrical energy into internal energy, so B is correct; when the TV is working, the electrical energy is mainly converted into sound energy, light energy and internal energy, So C is wrong; microwave ovens convert electrical energy into electromagnetic energy, so D is wrong.

2. [2017•Shanghai]The unit used when reading the household electric energy meter is (　B　)

A． kilowatt b. kilowatt hour

C. Coulomb d. volt

3. [2018•Sichuan Nanchong]Using an electric kettle to boil water, if the energy loss is not considered, when the voltage across it is U, it can boil a pot of water in 16 minutes. If the voltage across it is 0.8 When U, the time it takes to boil the same pot of water is (B)

A． 10 minutes b. 25 minutes

C. 30 minutes D. 40 minutes

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