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"Measuring Resistance" Ohm's Law PPT Courseware 2
1. If a resistor does not have a resistance value marked on it, how to measure the resistance value?
Experimental principle:
Ohm's law I=U/R
Deformation formula R=U/I
2. What physical quantities need to be measured in the experiment?
The voltage across the resistor and the current flowing through the resistor
3. This experiment requires multiple measurements. How to achieve multiple measurements?
Multiple measurements using sliding rheostat
4. Thinking: This experiment requires multiple measurements. What is the reason for multiple measurements?
Reduce experimental error
Thinking: (1) Is the function of the sliding rheostat in the experiment of this lesson the same as that of the sliding rheostat in the experiment to explore the relationship between current, voltage, and resistance?
(2) Is the purpose of the multiple measurements in the experiment in this lesson the same as that in the experiment to explore the relationship between current, voltage, and resistance?
(3) What are the common faults that occur when connecting circuits? what is the reason?
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"Measuring Resistance" Ohm's Law PPT courseware:
"Measuring Resistance" Ohm's Law PPT Courseware Want to Discuss 1. Current can be measured with an ammeter, and voltage can be measured with a voltmeter. So, how to measure resistance? 2. How to use Ohm's law to find a way to indirectly measure the resistance of a conductor? I =U/R ..