"Electric Energy and Electric Power" Electric Power PPT Courseware

Description

"Electric Energy and Electric Power" Electric Power PPT Courseware

teaching objectives

Know the sources of electrical energy and its applications

Able to read the parameter information on the electric energy meter

Know the units and conversion relationships of electrical energy

Be able to use the formula of electrical power to perform simple calculations

Knowledge review:

What is can?

What are the two factors of work?

What are the units of energy and work?

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

(2) Measurement of electric energy

An electric energy meter (watt-hour meter) is an instrument that measures how much electrical energy an electrical appliance consumes over a period of time.

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.

●“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.

●“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.

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

Example 1: On Sunday, Xiao Ming helped his mother cook at home. He found that when only the rice cooker was working at home, the turntable of the energy meter rotated 54r in 4 minutes. At the same time, he also noticed that the energy meter was marked with 1200r/kW·h. Please do the math. How much energy did the rice cooker consume during this period of time?

Solution: The electrical energy consumed by the electrical appliance for each revolution of the electric energy meter is 1/1200kW·h.

The electric energy meter rotates 54r. The electric energy consumed by the rice cooker is

W=54×1/1200kW·h=4.5×10-2kW·h

=4.5×10-2×3.6×106J

= 1.62×105J

∴How much power does the rice cooker consume during this period? 1.62×105J

(3) Electric power

1. Definition: The work done by electric current is called electrical work. Expressed by W, unit: joule (J)

2. The essence of work done by current: The process of work done by current is the process of consuming electrical energy, that is, the process of converting electrical energy into other forms of energy.

3. The size of the electric power

The 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.

Calculation formula: W=UIt

W — Jiao (J) U — Volt (V)

I — Ampere (A) t — Second (s)

High School Entrance Examination Connection:

(Hengyang 2013) The resistance of a conductor is 5Ω, the current passing through it is 0.2A, and the work done by the current on the conductor within 10s is _____J.

(Henan 2013) The number on Xiao Ming’s electric energy meter at the beginning of the month is 13855, and the number on the dial at the end of the month is as shown in the figure below. If the charge is based on the standard of 0.5 yuan/kW·h, his family should pay ____ yuan for electricity this month. If the turntable of the electric energy meter rotates 400 times in 10 minutes, then the work done by the current on the electrical appliance in these 10 minutes is For _____J.

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Update Time: 2024-11-20

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

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