"Electric Energy and Electric Power" Electric Power PPT Courseware 3

Description

"Electric Energy and Electric Power" Electric Power PPT Courseware 3

1. Electric energy

1. Generation of electrical energy:

Various power plants and batteries that convert different forms of energy into electricity

2. Utilization of electric energy:

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.

3. 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 = 1×103W×3600 s= 3.6×106 J

We have already known before that the ammeter can be used to measure the magnitude of the current; the voltmeter can be used to measure the magnitude of the voltage.

think about it

How do we measure how much energy our appliances consume each month?

After reading textbook P88, you must be able to answer the following questions 4-5:

2. Measurement of Electric Energy

4. The function of the electric energy meter is to measure the amount of electric energy consumed by electrical appliances.

Parameters of the electric energy meter: 220V means the rated voltage of the electric energy meter is 220V

10 (20) A means that the rated current of this electric energy meter is 10A. The current that can pass through it in a short period of time is allowed to be larger, but it cannot exceed 20A.

600r/kwh means that for every 1kw·h of electric energy consumed by an electrical appliance, the turntable of the electric energy meter rotates 600 times.

"50 ~" means used in 50HZ AC circuit.

2. Measurement of Electric Energy

There are several important parameters of the electric energy meter that should be noted:

●“220 V” indicates that this energy meter should be used in a 220 volt circuit.

●“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.

●“600 revs/(kW·h)” means that for every electrical appliance connected to this electric energy meter that consumes 1 kW·h of electric energy, the turntable on the electric energy meter rotates 600 times.

●“50~” indicates that this electric energy meter is used in an AC circuit with a frequency of 50 Hz.

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 per kilowatt hour in the area where Xiao Ming's home is located is 0.60 yuan. Please estimate how much electricity bill his home will have to pay in February.

Analysis: The electricity consumed in February is:

W=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

Life examples:

When the motor is energized and the motor rotates, it can drive the water pump to pump water to a high place. This shows that current can do work.

Can work be done by passing electric current through other electrical appliances?

What factors are related to the amount of work done by the current?

1. The relationship between the amount of work done by the current and the voltage

Close the switch and observe the brightness of the two lamps and the readings of the two voltmeters.

2. The relationship between the amount of work done by the current and the current

Close the switch and observe the brightness of the two lamps and the readings of the two ammeters.

3. What is the relationship between the amount of work done by the current and the power-on time?

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.

W=UIt

U——Volt (V)

I - An (A)

t——second (s)

W——Jiao (J)

Analysis of examples

1. There is an energy-saving lamp connected to a 220 V household circuit. The current flowing through it is 90 mA. Calculate how many kilowatt-hours of electricity this lamp consumes when used for 5 hours?

Analysis:

W=UIt

=220 V×0.09 A×5 ×3600s

=356400J

=0.099kW·h

The energy consumed by this energy-saving lamp when working for 5 hours is 0.099 kW·h, which is 0.099 degrees.

2. 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=3.6V×0.75A×3600 s=9720J

【Standard Compliance Test】【In-class Training】

1. The electric energy meter installed in the household circuit measures ( )

A. Current B. Voltage C. Electric energy (electrical power) D. Electric power

2. 0.2 kilowatt hour = ________Joule 7200000J = ________kw.h

3. "800R/kw.h" is marked on the electric energy meter.

The physical meaning is ___________. When an electrical appliance measured by this electric energy meter is working for a period of time, its dial rotates 600 times, then the electrical appliance consumes _____ degrees of electricity during this period, which is ______J.

4. The electric energy consumed in the process of current doing work is actually the process of converting ________ energy into ________ energy; battery charging is the process of converting ______ energy into ______ energy.

5. The work done by the current on a certain circuit is equal to the product of ______ at both ends of the circuit, ______ passing through the circuit and the power-on time, which can be expressed by the formula W=______. The unit of electrical power is ______.

6. There is a light bulb connected to a 220V household circuit. It glows for 10 hours and consumes 1 kilowatt hour of electricity. Question: What is the current flowing through this light bulb when it is working?

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Update Time: 2024-11-24

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

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