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Authoritative PPT Summary
"Electric Energy" PPT
Part One: Electric Power
1. Definition: work done by electric current
discuss:
What form of energy is electrical energy converted into?
2. Essence: Convert electrical energy into other forms of energy
Precise experiments show:
The work done by the current on a certain circuit is directly proportional to the voltage at both ends of the circuit, the current in the circuit, and the power-on time.
3. Formula: W = U I t
Meaning: The work done by the current on a certain circuit is equal to the product of the voltage at both ends of the circuit, the current in the circuit and the power-on time.
unit:
Joule (J) = Volt (V) Ampere (A) Second (s)
Kilowatt hour (kW·h), also known as "degree".
1 degree = 3.6×106 J
Electric energy PPT, part 2: electric energy meter
Commonly known as: watt-hour meter
1. Function: measure electrical power (energy)
Thinking: On the electric energy meter, the words "220V 5 (20)A" and "600r / kW·h" are written. What do they mean?
2. Reading:
Connect the electric energy meter to the circuit, and the counter on the electric energy meter can record the work done by the current. After using electricity for a period of time, you can know the degree of electricity used during this period by calculating the difference between the readings on the previous and last counters.
Electric energy PPT, part three content: Electric power
1. Definition: The work done by current per unit time
2. Meaning: Indicates how fast the current does work
3. Unit: Watt (W), kilowatt (kW)
4. Rated voltage and rated power:
Rated voltage: the voltage when the electrical appliance is working normally
Rated power: the power at the rated voltage of the electrical appliance
Electric energy PPT, Part 4 content: Classroom experiment
Experiment: Measuring the power of a small light bulb
Purpose: To measure the power of small light bulbs at rated voltage and not at rated voltage (it is known that the rated voltage of small light bulbs is 2.5V) and compare them.
Principle: According to the formula of electric power: P=UI.
Equipment: power supply, small light bulb, voltmeter, ammeter, sliding rheostat, switch, and some wires.
step:
① According to the purpose of the experiment, design the circuit and draw the circuit diagram.
② Design appropriate forms.
③Connect the circuit according to the circuit diagram.
④After checking that the circuit is correct, conduct the experiment.
⑤Experimental data processing.
⑥ Disassemble the circuit and organize the instrument.
Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, electric energy PPT download, .PPT format;
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