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Why is the sliding rheostat connected by partial voltage in the experiment of drawing volt ampere characteristic curve of small bulb?
The adjustable voltage range of the partial voltage type is larger than that of the current limiting type, which cannot be adjusted from 0V
Can ohmmeter be used to measure the internal resistance of meter head and power supply
There is basically no problem in measuring the internal resistance of the ohmmeter, but the meter with high sensitivity may be over range
Can the ohm range of the multimeter be used to measure the internal resistance of the power supply and the micro ampere meter? Why?
1. Measure the internal resistance
Use a multimeter to measure the open circuit voltage uo of the power supply, connect the rated load, and then measure the output voltage of the power supply
Then the internal resistance can be calculated according to Ohm's law of the whole circuit
2. Measure the internal resistance of the meter
The battery meter is connected in series with the variable resistance (select the safe resistance value and set it at the maximum value). When tuning the variable resistance, the meter indicates the under full scale. After separate measurement of the resistance value of the variable resistance, the rough value can be calculated, but it is generally enough
RELATED INFORMATIONS
- 1. Can the ohm range of the multimeter be used to measure the internal resistance of the power supply and the micro ampere meter?
- 2. The full scale current of a Ma meter is 1mA, the internal resistance of the meter is 98 Ω, and the shunt resistance is 2 Ω
- 3. Why is it necessary to make the half deviation of pointer as big as R resistance when measuring the internal resistance of meter head with half deviation method
- 4. Why is the measured value greater than the true value when measuring the internal resistance error of ammeter with half bias method
- 5. In the circuit shown in the figure, both ammeter and voltmeter are ideal ammeter, then the correct one in the following judgment is () --- the one that can understand (A) Rab = RBD, and RBC is the largest, RAC is the smallest, (B) Rab = RCD, and RBC is the largest, RAC is the smallest, (C) RAC = RCD, and RBC is the largest, RAD is the smallest, (D) RAC = RBD, and RBC is the largest, RAD is the smallest, -- see -- the answer is C. I don't quite understand. If the answer is the same, please forgive me for ignoring it
- 6. In the circuit, the resistance R1 is 10 Ω. Close the switch s, the indication of ammeter A1 is 0.3A, and the indication of ammeter A2 is 0.5A Ask: (1) current through resistance R2: (2) power supply voltage please write the process of solving the problem clearly
- 7. As shown in the figure, the power supply voltage remains unchanged. When the switches s and S1 are closed, the indication of the ammeter is 1a. When the switch S is closed and the switch S1 is open, the indication of the current is 0.6A. The ratio of the resistance value of resistance R1 to resistance R2 is () A. 3：2B. 2：3C. 5：3D. 3：5
- 8. A classmate didn't have an ammeter. He had a power supply voltmeter. The rheostat setting resistance R0 resistance was known. How to measure the small lamp with known rated voltage Experimental circuit diagram experimental steps need to measure the physical quantities and calculation formula! Hurry!
- 9. As shown in the figure, the power supply voltage U remains unchanged, and the indication of ammeter is 2A. Resistance R1 and R2 are in parallel, equivalent resistance R, and R1: r = 4:3, If the power consumed by resistor R2 is 2.5W. Find the power supply voltage
- 10. Explore the experiment (1) given a power supply, a voltmeter, a constant resistance (known its resistance), a number of switches and wires, try to design a circuit diagram It can measure the resistance of an unknown resistance according to certain steps You want to draw a picture for me~ In addition, the corresponding letters should be used to represent the physical quantities measured by the elder brother Represents each measured physical quantity Can you give me a picture
- 11. Pay attention when using ammeter
- 12. When measuring the current with a DC ammeter, if the reference direction is inconsistent with the actual direction, what will be displayed? How to correctly judge the measured current direction? Such as the title
- 13. How to know the electricity consumption of the meter in a month by measuring the current in front of the meter with a clamp ammeter?
- 14. The ammeter must be connected in series in the circuit to be measured. Under what circumstances is the ammeter connected in parallel in the circuit to be measured? Please use the circuit diagram. Also, I said in my book that the ammeter can't be directly connected in parallel with the consumer or ammeter. What's the circuit diagram in this case?
- 15. A series circuit. The ammeter is between two lamps. Which lamp's current is measured by the ammeter
- 16. When using the ammeter! Why do you need zero correction? If the measured current exceeds the range of the ammeter, what will happen!
- 17. Xiao Hong wants to measure the current of a circuit, but she can't estimate its size. How should she choose the range of the ammeter? When she connected the ammeter to the circuit, the pointer deflected to the side without scale. What's the reason?
- 18. [electricity] Why is the ammeter connected in parallel with a small resistor, and the voltmeter connected in series with a large resistor and a sensitive galvanometer, so the sensitive galvanometer becomes an ideal state [electricity] does sensitive galvanometer have resistance? Why is the ammeter connected in parallel with a small resistance, and the voltmeter connected in series with a large resistance and sensitive galvanometer
- 19. An ammeter and a voltmeter are sensitive galvanometers (series or parallel) and extremely (large or small) resistors
- 20. How to measure the constant resistance of small bulb if there is only voltmeter but no ammeter