"Measurement of Resistance by Voltammetry" Exploring Circuit PPT Courseware 2

Description

"Measurement of Resistance by Voltammetry" Exploring Circuit PPT Courseware 2

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?

Outward training

1. Under the guidance of the teacher, a student used a voltmeter and an ammeter to measure the resistance of a household lighting bulb. The measured voltage at both ends of the bulb was 220V, and the current through the bulb was 0.28A. Then the resistance value of the filament when the bulb glows normally is ＿＿Ω．

2. A classmate used voltammetry to measure the resistance of a section of conductor. The experimental plan and operation process were correct. The readings on the two tables are as shown in the figure. What do you think can be improved in this experiment is ___________. Your reason for doing this is ____________.

3. A student used the figure to conduct an experiment of "measuring resistance using voltammetry". The power supply voltage was 6 volts. All components are intact and the circuit connections are correct. When he just closed switch S, he found that the voltmeter read 6 volts, and the reason was __________.

4. Now you are given a fixed-value resistor R0 with a known resistance, two ammeters, batteries, switches, and sufficient wires. You are required to measure the resistance Rx of an unknown resistor. Requirements: 1) Draw an experimental circuit diagram ;2) Briefly describe the experimental process and express RX using known quantities and measured quantities.

Keywords: Teaching courseware for exploring circuits, teaching courseware for measuring resistance by voltammetry, downloading the complete ninth-grade physics PPT courseware of Shanghai Science Edition, downloading courseware for ninth-grade physics slides, downloading PPT courseware for exploring circuits, downloading PPT courseware for measuring resistance by voltammetry ,.PPT format;

For more information about the PPT courseware "Exploring Circuit Voltammetry to Measure Resistance", please click the Explore Circuit ppt Voltammetry to Measure Resistance ppt tag.

"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware 3:

"Measurement of Resistance by Voltammetry" Exploration Circuit PPT Courseware 3 So far, what physical quantities have we learned so far about the electrical knowledge we have learned? How to measure the resistance of a small light bulb I =U/R R=U/I R=U/I means that the resistance of the conductor is numerically equal to the voltage applied to both ends of the conductor and the voltage passed through..

"Measurement of Resistance by "Voltampere Method"" Exploring Circuit PPT Courseware:

"Measuring Resistance by Voltammetry" Exploration Circuit PPT Courseware Experimental Investigation: Measuring the resistance of a light bulb when it is working (1) Ask the question: How to use __________ meter and __________ meter to measure the resistance of a section of conductor? (2) Method: _____. (3)Principle:_____. (4) The circuit diagram is as follows..

File Info

Update Time: 2024-10-20

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

Preview