"Exploration - The Electric Power of a Small Light Bulb" PPT Courseware on Electric Work and Electric Power

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"Exploration - Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware

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1. Electric power is a physical quantity that represents ___________

2. Two basic formulas for electrical power:

P=W/T P=UI

3. Take a "36V 25W" light bulb, connect it _________ to the 36V circuit, it _________; connect it to the 24V circuit, it _________; connect it to the 40V circuit, it___________ _________.

4. Rated power:

The power of electrical appliances when operating normally at rated voltage.

5. Actual power:

Since the actual voltage of the circuit is not necessarily exactly equal to the rated voltage of the electrical appliance, the actual power of the electrical appliance when working is not necessarily equal to the rated power. The power of the electrical appliance when it is actually working is called actual power.

Experiment purpose: measure the rated power and actual power of small light bulbs

experimental design:

1. What physical quantities need to be measured in the experiment?

2. Select experimental equipment according to the physical quantities that need to be measured. Think about it, how do you change the voltage across a small light bulb?

Experimental Notes

1. When connecting the circuit, the switch should be turned off and the slider of the rheostat should be moved to the maximum resistance value.

2. The connecting posts of ammeter, voltmeter and rheostat must be correct.

3. The slider of the rheostat must move regularly (so that the voltage at both ends of the bulb gradually becomes smaller or larger), and the recorded voltage and current values ​​must correspond one to one.

4. The voltage at both ends of the bulb cannot exceed the rated voltage by too much, otherwise the bulb will burn out.

Analysis and Conclusion

1. How to calculate the electric power of a small light bulb based on measured data?

2. What is the rated power of the small light bulb?

3. When the voltage across the small light bulb is higher or lower than the rated voltage, what is its actual power?

(1) When U real = U forehead, then P real = P forehead, normal light emission

(2) When U real < U amount, then P real < P amount is darker

(3) When U real>U amount, then P real>P amount is brighter

think

1. Think about it, which aspects of the experiment are most likely to cause errors?

2. What mistakes did you make during the experiment? What were the reasons?

3. What new problems did you find during design, operation and analysis?

In several sets of measured data, the ratios of voltage and current are not equal. The higher the voltage, the greater the U/I. This is because when the voltage increases, the power consumption of the bulb increases, the temperature of the filament increases, and its resistance increases.

Discuss and communicate

At what voltage can a small light bulb normally emit light? At what voltage does the rated power refer to the electrical power consumed? When the working voltage is lower or higher than the rated voltage, is the actual power consumed by the light bulb equal to the rated power? Is the actual power of the electrical appliance used? Does it vary with its operating voltage?

Summarize

What did you learn in this lesson? Please tell me and share it with everyone.

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"Exploration - Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware 3:

"Exploring the Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware 3 Project Main Contents Method of measuring the electric power of small light bulbs. In the experiment of measuring the electric power of small light bulbs, use _______ to measure the voltage across both ends of the small light bulb and use _______ to measure it. The current passing through the small light bulb...

"Exploration - Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware 2:

"Exploring the Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware 2 Determining the Electric Power of Small Light Bulbs Experimental Purpose: Determining the Electric Power of Small Light Bulbs Experimental Principle: P=UI Experimental Method: Voltammetry Experimental Equipment: Power Supply Ammeter Voltmeter Sliding Rheostat Small Light Bulb Small lights..

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Update Time: 2024-09-28

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