Question 1: What are the approximate resistances of the human body and the earth? The human body has between 20,000 and 200,000, but it will be broken down by high-voltage electricity, and it is very small at the moment. Earth serves as the negative pole for all power supplies, regardless of resistance.
Question 2: What is the resistance of the earth? To protect equipment and personal safety, electrical equipment shells often use protective grounding or protective grounding of the working neutral line in three - four phase wire circuits. It is also to ensure that the three-phase unbalanced current flows smoothly into the ground and returns to the generator end to form a loop protection grounding body. The burial depth of the earthing body must be greater. only 1.5 meters. We can say that the resistance of the earth to thisThis depth is 0 ohm (because the ground below this depth is due to the very wet electrolyte which must dissolve with water to form a good conductor, so the resistance of the earth there is about 0) . In the phase-zero circuit, the neutral line current enters the earth and is also returned to the generator end. Since people cannot live without electricity, the earth There is a strong current below 1.5 meters. the currents are finally returned to the generator end via electrical devices
Question 3: Earth resistance is uncertain!
Earth is a conductor and the resistance is different when the circuit is connected from two different points.
Question 4: Is the conductive capacity of the earth great? What is the resistance between two points on the earth? First of all, the earth is not a good conductor on the surface? , it seems that the surfaceof the earth is composed of high resistance objects. Yes, but that doesn't stop the earth from becoming a supercapacitor. Usually we use earth or infinity as a potential zero point. charge that you inject into the earth (earth)
Question 5: Earth is a conductor, does it have resistance, and what is the resistance (1): Draw it? following figure according to the point drawing method: (2): From the θ-U image, it can be seen that 20℃, 40℃, The voltmeter readings corresponding to the four temperature values of 60℃ and 80℃ are : 20℃-1.83; 40℃-1.08; 60℃-0.62; 80℃-0.42. From the data on the graph, it can be seen that the reading range of the voltmeter is in the “0-3” range. the range "0-3" is therefore selected. (3): According to the circuit diagram: U 0 = U + U R 0, the current through the circuit is I = U R 0R 0, then the thermistor is: R t = UI, combining the above solutions, we obtain: R t = UR 0U 0?U According to the image, the voltmeter voltage U=1.83 at 20°C can be read. By replacing the formula above, we obtain: R t=0.36 kΩ; As shown in (2) range "0-3" (3) 0.36 KΩ, R t=UR 0U 0?U
This probably requires a detailed explanation. Go to Hard City and take a look. Maybe someone. can.