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What are the functions of resistance, current, voltage and relay in the circuit
Resistance: current limiting, protection, discharge, pull-up, pull-down, oscillation, partial voltage, etc
Current: when the electrical components are working, there is current passing through the components. Large current means that the power consumption of current is relatively large, and vice versa
Voltage: the most direct way to measure the quality or working condition of a circuit is to measure the voltage or waveform. Some components have their own fixed working voltage or the highest (dangerous) voltage
Relay: after a coil is electrified, a magnetic field is generated to absorb the shrapnel to the other side and connect with other contacts. Generally, relays have single pole, double pole, three pole and four pole output modes of normally open or normally closed or normally open and normally closed. It is generally used for output to control high current electrical appliances or on-off output
In studying the relationship between current, voltage and resistance, the scientific guidance book says that the function of sliding rheostat R 'is to protect the circuit and change the voltage at both ends of the resistance——
However, how to change the voltage at both ends of the resistance? Is that voltage related to the resistance? Sliding P can only change the resistance, how can it change the voltage?
Changing the resistance will change the current, and the voltage on both sides of the resistance will change! Of course, the power supply voltage will not change (regardless of the internal resistance)!
Does the resistance in parallel with the voltage source work in the circuit? Is it equal to the resistance in series with the current source?
The series resistance equivalence of voltage source is Thevenin's theorem, and the parallel resistance equivalence of current source is Norton's theorem. You can check the circuit analysis. There are formulas for how to be equivalent, how to break each branch, and how large it is
RELATED INFORMATIONS
- 1. To explore the relationship between current and voltage through the conductor, how to keep the resistance constant when the sliding rheostat changes the voltage in the test To explore the relationship between current and voltage through the conductor in the test Slide the rheostat to change the voltage. I know, but when you move the rheostat, the voltage changes and the resistance changes Why can the resistance remain unchanged? The length of the current has changed
- 2. In the experiment of exploring the relationship between the current through the resistance and the resistance value, the function of sliding rheostat is_____
- 3. 1. When moving the slide of the sliding rheostat, which two terminals will change the resistance? Which direction will the resistance increase? 2. In order to turn the bulb from dark to light, where should the slide of the sliding rheostat be placed before connecting the circuit?
- 4. What is the change of the total resistance during the movement of the sliding rheostat in the divider circuit? Tell me why
- 5. In sliding rheostat, AC, BC, BD and ad move R (resistance) and I (current) in P direction?
- 6. How to choose the connection method of sliding rheostat for measuring resistance by voltammetry?
- 7. What is the function of sliding rheostat in measuring resistance by voltammetry
- 8. Physical electricity: measuring the resistance of a small bulb, Now you don't have an ammeter. You only have a voltmeter, a sliding rheostat, a 10 ohm quantitative resistor, a 6V power supply, a switch and several wires. At this time, you can't measure the resistance of a small bulb by volt ampere method. What's the resistance of a small bulb? You need a circuit diagram,
- 9. Is a resistance and a light bulb a pure resistance circuit?
- 10. A bulb marked with "pz220-40", the normal luminous current of the lamp is a, and the resistance is a
- 11. The correct statement about conductor resistance is () A. Because the resistance of the conductor indicates the resistance of the conductor to the current, when there is no current in the conductor, the resistance of the conductor is zero. B. the greater the voltage at both ends of the conductor, the greater the current, so the resistance of the conductor decreases with the increase of the voltage. C. the resistance of the conductor is the property of the conductor to block the current, and its size has nothing to do with the voltage and current intensity The greater the voltage at both ends of the conductor, the greater the current, so the resistance of the conductor increases with the increase of voltage
- 12. Four practical questions on how many points to get
- 13. 4 Calculation questions Zero - half - (minus three fourths) + (minus five sixths) - two thirds |Negative two and a half | - (- 2.5) + 1 - | - 1-two and a half| 13-[26-（-21）+（-18）] [1.4-（-3.6+5.2）-4.3]-（-1.5） We need a process. Thank you
- 14. Calculation of atmospheric pressure For a pressure cooker with a diameter of 20cm, the cross section of the vent is 10mm ^ 2. If the maximum pressure of steam in the cooker is 1.7 * 10 ^ 5pa, what is the mass of the pressure limiting valve? (set the external pressure as 1 * 10 ^ 5pa)
- 15. Very simple score calculation problem Oh, help to calculate, OK One eighth multiplied by two is equal to one Twelve times three eighths is equal Eight out of twenty-five divided by four out of five equals Four fifths divided by three fifths is equal to four fifths Two divided by two thirds is equal to two Two out of eleven times eleven out of four is equal to one Four ninths divided by three fifths is equal to three fifths Five eighths divided by five twelfth equals five Half of a thirtieth divided by a quarter equals half
- 16. 1. The fruit store brought in 180 kg of fruit, sold 2 / 5 of the fruit on the first day, and sold the remaining 3 / 4 the next day. How many kg of fruit are left? 2. The school canteen bought a barrel of oil, which weighs 24 kg. The first time it used 1 / 4 of the total oil, the second time it used the remaining 1 / 3, and the third time it used 1 / 2 of the oil in the barrel. How many kg of oil is left in the barrel?
- 17. How many ohm resistor should be connected to 120 white LED lamps connected to 12 volt dry battery? The voltage will drop if there are too many
- 18. What is the resistance value of a resistor when a voltage of 10V is applied at its two ends and the current is 0.5A?
- 19. When a fixed value resistor is applied with 10V voltage at both ends, the current is 0.5A. If the voltage at both ends of the resistor is 0, what is the resistance value?
- 20. The two lamps are connected in parallel, the known resistance R1 = 5 ohm, the main circuit current I = 0.5A, the voltage at both ends of R2 U2 = 2V, and the circuit current I = 0.5A The two lamps are connected in parallel, the known resistance R1 = 5 ohm, the driving current I = 0.5A, and the voltage at both ends of R2 U2 = 2V 1. Find the current through R1 2. Current through R2 3. Resistance of R2 It's a process. Thank you