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"Exploration - Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware 2
Determine the electrical power of a small light bulb
Experiment purpose: To measure the electrical power of small light bulbs
Experimental principle: P=UI
Experimental method: voltammetry
Experimental equipment: power supply, ammeter, voltmeter, sliding rheostat, small light bulb, small lamp holder, switch, wire
Experimental steps:
1. Design and draw the circuit diagram.
2. Connect the circuit according to the circuit diagram. Initially, place the sliding blade of the sliding rheostat at the position with the highest resistance.
3. Close the switch and connect the circuit.
4. Adjust the sliding rheostat so that the bulb emits light at the rated voltage; write down the electrical meter and calculate the electrical power at this time.
5. Adjust the sliding rheostat so that the voltage at both ends of the bulb is higher than 1/5 of the rated voltage; write down the electrical meter and calculate the electrical power at this time.
6. Adjust the sliding rheostat so that the voltage at both ends of the bulb is 4/5 of the rated voltage; note down the electrical meter and calculate the electrical power at this time.
practice
1. If the power supply voltage in the experiment is only 3V, how to measure the rated power of the light bulb (tell the measurement method)
The readings of the two meters during a certain measurement are as shown in the figure:
Then the rated power of the small light bulb is approximately ____W
2. The picture is a circuit diagram used by a student to measure the rated power of a 2.5V small light bulb.
(1) The sliding rheostat must be adjusted at least twice during the experiment. The first adjustment is to make ________, the slide P should move to the ______ end, and then connect the circuit. The second adjustment is to make _____ and observe the light emission of the small bulb. When adjusting this time, first observe the reading of _________. When the reading of the voltmeter is _______ volts, it meets the requirements. At the same time, write down the voltmeter, From the current meter reading, calculate the power rating of the small bulb.
(2) The data recorded by the student in the three measurements are as follows. Analyze the data in the table to find out the rated power of the small light bulb as ______.
3. In the "Experiment of Measuring the Electric Power of a Small Light Bulb", the circuits connected by four students in a certain class are as shown in the figure, and the correct connection is ( )
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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:
"Exploring the Electric Power of Small Light Bulbs" Electric Power and Electric Power PPT Courseware Review 1. Electric power is a physical quantity that represents ___________ 2. Two basic formulas for electric power: P=W/T P=UI 3. Take a 36V 25W light bulb and put It is connected _________ to the 36V circuit..