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Authoritative PPT Summary
"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 6
Questions and Thoughts
The teacher provides the students with several unmarked resistors, one of which is 12 Ω. Can you find out the 12 Ω resistor through experiments?
Experimental principle
According to Ohm's law I=U/R, it can be transformed into R=U/I. Use a voltmeter to measure the voltage U at both ends of the conductor, and use an ammeter to measure the current I in the conductor, and then the resistance R can be found.
Precautions
1. When connecting a circuit, the switch should be ______ and the sliding rheostat should be adjusted to connect to ______ to protect the circuit.
2. The range of ammeter and voltmeter should be selected appropriately. Generally, it is appropriate to use the instrument pointer ______. The measurement range is determined by, first, ______; second, by estimating the ______ of the voltage and current, and selecting the appropriate range.
The function of sliding rheostat
1. Protect the ammeter, voltmeter and resistance to be measured.
2. After moving the slider, change the resistance of the connected circuit, thereby changing the voltage and current at both ends of the resistance to be measured. You can measure the resistance value multiple times and calculate the resistance value each time, and take the average to reduce the error.
Exchange and discussion
Exchange the resistance to be measured with students from other experimental groups, repeat the above experiment, and compare whether the measurement results are the same. If the measurement results are different, please analyze the reason? and propose improvement plans.
Think about it, discuss it
Have you ever encountered such a problem during experiments? How did you solve it?
After connecting the circuit according to the circuit diagram and confirming that it is correct, close the switch and find:
1. The ammeter reads 0 and the voltmeter is almost full.
2. The voltmeter or ammeter pointer is reverse biased.
3. No matter how you move the slider, the current indication remains unchanged.
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"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 7:
"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 7 Project main content Voltammetry Use a voltmeter to measure the ______ at both ends of the conductor, use an ammeter to measure the ______ passing through the conductor, and then use ______ to find the resistance of the conductor Principle of resistance experiment R=______..
"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 5:
"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 5 [Think about it] The content and mathematical expression of Ohm's law I=U/RR=U/I U is measured with a voltmeter (voltmeter) I Measuring with an ammeter (ammeter) [Go into the classroom] [Experiment name] Measuring the conductor...
"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 4:
"Measuring the Resistance of a Conductor According to Ohm's Law" Ohm's Law PPT Courseware 4 There is a resistor with an unknown resistance in the laboratory. How to measure its resistance? Pass a current through the resistor, measure the current value and the voltage across the resistor, and apply Ohm's law to find Rx..