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Give you a resistance, voltmeter, switch, power supply and wire with known resistance value. Please design an experiment to measure the resistance value of unknown resistance Rx. (1) draw the circuit diagram of the experiment. (2) write the experimental steps. (3) write the expression of Rx. (4) in addition to the method of substitution with known resistance, You can also use switch (or single pole double throw switch), sliding rheostat to solve the unknown resistance. Students use their brains to think, can you use other methods to measure the resistance of the unknown resistance?
(1) Experimental circuit diagram: the power supply, the resistance with known resistance and the resistance to be measured are connected in series to form the experimental circuit. The voltmeter measures the voltage drop on the two resistances respectively. (2) experimental steps: A. connect the wires according to the circuit diagram. B. turn on the power supply. C. adjust the voltage output of the power supply and measure the voltage drop on the known resistance at the same time
Give you a known resistance value of resistance, voltmeter, switch, power supply and wire, please design an experiment to measure unknown resistance RX (fixed value)
Connect the known resistance and the unknown resistance in series with the power supply, and then measure the voltage at both ends of the two resistors. The ratio of the two voltages is equal to the ratio of the two resistors
Three ammeters A1 range 50mA, internal resistance 100 Ω a2100ma, 40 Ω a3,3a, 0.1 Ω rheostat, 0-10 Ω power supply 12V without internal resistance. Rx is about 100 Ω. Calculate RX resistance
You don't have to use all the components.
To make all ammeters in a safe state, the current should be less than the minimum one, namely 50mA, 0.05A
So the total resistance in the circuit = 12 / 0.05 = 240 ohm
RX min = 240-100-40-0.1 = 99.9 Ω
RX must be greater than 99.9 Ω
Give you a power supply (unknown voltage), a voltmeter, a switch, a number of wires, a known resistance, and measure the value of an unknown resistance R
Please design the experimental steps and write the expression of R. please do it as soon as possible~
1. Set the known resistance value as R1, and connect R1 in series with the unknown resistance at both ends of the power supply,
2. After the circuit is connected, use a voltmeter to measure the voltage at both ends of the power supply as U0,
3. Measure the voltage at both ends of R1 as U1
4. According to the above data, the unknown resistance value is: the voltage on R is u = u0-u1, R is in series with R1, the current is equal, I = U1 / R1, so r is equal to U / I, and the R value is obtained
RELATED INFORMATIONS
- 1. There are the following equipment on the experimental table: a power supply, an ammeter and a voltmeter, a switch, a sliding rheostat, two resistance boxes, fixed resistance and wires with known resistance values. It is required to select appropriate equipment from the experimental table and design an experiment to prove: "when the voltage at both ends of the resistance remains unchanged, the electric power consumed by the resistance is the same as that consumed by the resistance The resistance of the resistance is inversely proportional. Please draw the experimental circuit diagram, write the experimental steps, and design the data recording form
- 2. What is the effect of changing the 100 ohm resistance in series with the ammeter to 200 ohm in the circuit diagram of superposition theorem on the measurement result
- 3. How to judge which electrical appliance is measured by Voltmeter and ammeter As the title I'm sorry. For example, if two switches are closed, which appliance is short circuited, and if two switches are open?
- 4. For the circuit shown in the figure, the power supply voltage remains unchanged, R2 = 60 Ω. When the switch S is off, the indication of the ammeter is 0.5A; when the switch is closed, the indication of the ammeter is 0.6A. Calculate the resistance of R1
- 5. As shown in the figure on the right, R1 = 30 ohm, R2 = 10 ohm. After closing the switch, the indication of ammeter A is 2a to calculate the power supply voltage!
- 6. As shown in the figure, in the circuit, the power supply voltage is constant, R1 = 6 Ω, R2 = 4 Ω. When S1 and S2 are closed, the indication of ammeter A1 is 1a, and the indication of ammeter A is 2.5A. Calculate: (1) the resistance value of resistance R3 and the indication of voltmeter. (2) when S1 and S2 are both open, the indication of ammeter A1, a and voltmeter v
- 7. The power supply voltage is constant, R1 = 6ohm, R2 = 12ohm, sliding rheostat R3 = maximum resistance value 0, ammeter range is 0 ~ 0.6A, voltmeter range is 0 ~ 3V, open S1, close S2, the heat generated by current through R1 within 10 seconds is 60 joules, power supply voltage is u =? Sliding rheostat R3 = maximum resistance 20 ohm
- 8. As the circuit shown in the figure, the power supply voltage is 12V, the resistance value of R1 is 10 Ω, the number of a meter and A1 is 1a and 0.4A respectively, then what is the resistance value of R2?
- 9. In the circuit shown in the figure, the voltage U remains unchanged, the resistance R1 = R2, when the switch S is open, the indication of the ammeter is I1; when the switch S is closed, the indication of the ammeter is I2, then I1: I2=______ ．
- 10. A series circuit ammeter calculates the current representation between two resistors
- 11. 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
- 12. 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
- 13. 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!
- 14. 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
- 15. 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
- 16. 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
- 17. Why is the measured value greater than the true value when measuring the internal resistance error of ammeter with half bias method
- 18. 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
- 19. 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
- 20. Can the ohm range of the multimeter be used to measure the internal resistance of the power supply and the micro ampere meter?