"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 4

Description

"Measuring the resistance of a conductor according to Ohm's law" Ohm's law PPT courseware 4

There is a resistor with 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 the value of Rx.

Measuring resistance using voltammetry

Purpose: Learn to measure the resistance value of a resistor using voltammetry

Principle: Ohm's Law

Equipment: battery resistors, switches, resistors, ammeters, voltmeters, sliding rheostat, wires

Steps: 1. According to the measurement principle, design the circuit diagram and connect the circuit.

2. Close the switch, adjust the sliding rheostat so that the current is an appropriate value, read the values ​​of U and I from the voltmeter and ammeter respectively, conduct three experiments, and obtain three sets of data.

3. Fill in the experimental data in the table and calculate the average value of the resistance.

Precautions

1. When connecting the circuit, the switch should ____. Before closing the switch, the slider of the sliding rheostat should move to the _______ position.

2. The function of sliding rheostat

(1) Protection circuit;

(2) Change the current and voltage in the circuit to facilitate multiple measurements and average values ​​to reduce errors.

discuss:

1. What is the purpose of doing this experiment three times? How is this different from the purpose of the three experiments to study the relationship between current, voltage, and resistance?

2. When the switch is closed and the slider of the sliding rheostat slides to the left, how will the indications of the two meters change? What about the voltage across the sliding rheostat?

3. In an experiment, a classmate discovered that after closing the switch, the pointer of the ammeter barely moved, but the pointer of the voltmeter deflected significantly. What might be the cause of the malfunction in the circuit?

4. The resistance value measured in the third experiment is too high. What may be the reason?

What items should a complete experimental report include?

It should include: name of the experiment, purpose, principle, equipment, procedures, experimental data records, experimental conclusions, discussion, etc.

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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 6:

"Measuring the Resistance of a Conductor According to Ohm's Law" Ohm's Law PPT Courseware 6 Questions and Thoughts The teacher provided the students with several unmarked resistors, one of which is 12. Can you find out the resistance of this 12 through experiments? The experimental principle is based on Ohm's law..

"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...

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Update Time: 2024-10-03

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