"Electric Energy and Electric Power" Electric Power PPT Courseware 4

Description

"Electric Energy and Electric Power" Electric Power PPT Courseware 4

teaching objectives

Know electrical energy, its units and unit conversions

Know the function of the electric energy meter, the meaning of several parameters on the meter and the reading method, and be able to calculate the amount of electrical energy consumed based on the readings of the electric energy meter.

Understand the energy conversion of power sources and electrical appliances during operation. Students will use the electric power formula to calculate the electrical energy consumed by electrical appliances.

Electrical energy Symbol of electrical energy: W

1. The process of working with electrical appliances is the process of consuming electrical energy.

That is: the process of converting electrical energy into other forms of energy.

2. Unit of electrical energy:

SI unit of energy: Joule (J)

Units of electrical energy in daily life: degree, kilowatt hour (kW·h)

1 degree=1 kW·h = 1×103 W×3600 s= 3.6×106 J

practice

The electric energy meter readings at Xiao Ming's home at the end of January and February are as shown in the figure. The electricity bill in the area where Xiao Ming's home is located is 0.60 yuan/kWh. Please estimate how much electricity bill his home will have to pay in February.

Analysis:

The electricity consumed in February is:

3394.5 kW·h－3287.5 kW·h = 107 kW·h

The electricity charges payable are:

107 kW·h×0.60 yuan/(kW·h) = 64.2 yuan

If the power consumption is very small and the data at the end of the table hardly moves, then how can we know the power consumed?

Example: An electric energy meter marked with 1800R/kwh, if the aluminum plate rotates 90 times, the energy consumed is ____kw·h.

"Revolution method" measurement

So if you know the power consumed, can you find the number of revolutions of the aluminum disk?

Electric power

1. The process of converting electrical energy into other forms of energy is the process of current doing work.

How much electrical energy is converted is said to be how much work the current has done.

2. Calculate the work done by the current:

The amount of work done by the current is related to the size of the current, the level of the voltage, and the length of the power-on time.

practice

The voltage across the small light bulb is 6V, the current passing through it is 1A, and the work done by the current in 1 minute is _____J.

An electric heater is connected to a 220V power supply, and the current is 1.2A. If it is energized for 10 minutes, the current will do work ＿＿＿J and consume ＿＿＿J

Rechargeable batteries are commonly used as power sources in mobile phones, digital cameras, etc. The voltage of a mobile phone battery is 3.6 V and the ampere-hour capacity is 750 mA·h. The electrical energy stored when it is fully charged is _______J.

Analysis:

Battery parameters include: voltage and ampere-hour capacity (A·h)

Amp-hour capacity = discharge current (A) × discharge time (h)

750 mA·h= 750 mA×1 h

W = UIt = 3.6 V × 0.75 A × 3600 s = 9720 J

Class summary

The resistances of the two electrical appliances are R1=10Ω and R2=20Ω respectively; find:

(1) When these two electrical appliances are connected in series in a circuit with a voltage of U=6V, and the power is energized for 5 minutes, how much work is done by the current flowing through each electrical appliance? What is the total work done by the current flowing through the two electrical appliances?

(2) When these two electrical appliances are connected in parallel in a circuit with a voltage of U=6V, and the power is energized for 5 minutes, how much work is done by the current flowing through each electrical appliance? What is the total work done by the current flowing through the two electrical appliances?

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Update Time: 2024-10-02

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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