How to choose the range of ammeter, voltmeter and rheostat when measuring resistance by voltammetry Ah?

2. According to I = u / R, according to the measured resistance value, select the voltage of the power supply, calculate the current (it should be able to stably supply such a large current), and make the voltage and current values within the range of the voltmeter and ammeter

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1. What is the symbol of resistance The unit of resistance is Ohm. What is the symbol of ohm for short? There are only two kinds of charges in nature. What and what are they? When charges interact with each other, what are the same kind of charges and what are the different kinds of charges
2. The price of type a refrigerator sold in shopping malls is 2190 yuan per unit, and the daily power consumption is 1 degree, while the price of type B energy-saving refrigerator is 10% higher than that of type a refrigerator, but the daily power consumption is 0.55 degree? (calculated according to the service life of 10 years, 365 days per year and 0.40 yuan per kilowatt hour)
3. The existing pz220-40 and pz220-100 bulbs each one, put them in parallel in the 220 V circuit, they can normally light up, now give you one The existing pz220-40 and pz220-100 bulbs have one each. If they are connected in parallel in a 220 V circuit, they can light normally. Now I give you a variable resistor. When the variable resistor is connected with a certain bulb, the power of the two bulbs should be the same (the brightness is the same). Draw the circuit connection diagram and calculate the resistance value of the variable resistor
4. After the resistor R1 and R2 are connected in series to a 3V power supply, it is known that the resistor R1 = 3 Ω and the consumed power P1 = 0.12W Find the current on the circuit, the voltage at both ends of resistance R1, and the power of R2
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6. How is the capacitance converted? (detailed) how much UF is 1000pf equal to
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9. What is the difference between the symbol of physical quantity and that of unit in physics? If the physical symbol and the unit symbol are the same, for example, the physical symbol is w, and the unit symbol is w, how to distinguish them?
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11. In the experiment of studying the relationship between current and voltage, resistance, when studying the relationship between current and resistance () A. Adjust the sliding rheostat to keep the current in the circuit unchanged B. adjust the sliding rheostat to keep the voltage at both ends of different fixed resistance R unchanged C. make the voltage at both ends of resistance R change in multiple D. make the current in the circuit change in multiple in each measurement
12. The plural is such a difficult problem Let Z1, Z2 satisfy Z1 ^ 2 = Z2, Z1, Z2 are the two roots of a quadratic equation with real coefficients, 1) find the value of Z1, Z2, 2) if Z1 = 1 + Ti (T > 0) | Z1 | ≤ radical 2, complex u = Z2 + 3, find the value range of | u |
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18. When m is a real number, z = (1 + I) M & sup2; + (5-2i) m + (6-15i) is a real number, an imaginary number and a pure imaginary number
19. The plural of family is written in double L
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