How many square copper wires is 70 square aluminum wires equal to

Generally speaking, considering safety, the safety current of 1 square copper wire is 6a, and that of 1 square aluminum wire is 4a. If 70, it is about 46 square copper wire

How to calculate the final power consumption of household appliances with live wire connected to power meter and zero wire connected to lighting meter?

If single phase meter 1 and 2 are zero line, you have to pay double electricity charge

RELATED INFORMATIONS

1. How many hours does a 500W electric oven consume 1 kilowatt hour, and how many hours can a 100W lamp work
2. 380V, the power of the elevator is 60kW, how to calculate the size of the current and air switch, and the thickness of the cable!
3. What electrical appliances use alternating current
4. Home bought a 220 V 5A printer, and the home meter is 220 V 10 (60) a, this printer can be used directly?
5. How to connect 120 existing 220 V 100 W incandescent lamps to the three-phase four wire power supply line with 380 V line voltage is the most reasonable? According to this solution, what are the line current and the neutral current when all the lamps are on?
6. A rice cooker is marked with the word "220V 3A". How many joules does the current do in 20 minutes of normal operation?
7. A power is 400W, the voltage of 220 V rice cooker, how much electricity consumption in three hours?
8. Under the condition of a certain voltage, is there any difference between limiting power and limiting current? Why can't a 500W electric appliance (hot water kettle) be used in a 1000W circuit
9. When a 220 V, 100 W light bulb is connected to a 220 V power supply through a section of wire, its actual power is 81 W, then how much power is lost on the wire?
10. If two bulbs of 220 V 60 W and 220 V 40 W are connected in series and parallel in 220 V circuit respectively, 40 W is brighter, but why is the resistance of 40 W bulb larger than 60 W? If two bulbs of 220 V 60 W and 220 V 40 W are connected in series in 220 V circuit, 40 W is brighter, but why is the resistance of 40 W bulb larger than that of 60 W?
11. Air switch. I found that the main switch in the distribution box is an air switch. Then it leads to lighting, socket, air conditioner, etc. in this way, I think that if any downstream fault occurs, the main switch will trip and all circuits of the whole family will lose power. Considering that there are air switches in each branch, does the main switch still need to use air switch? Does it need dual protection?
12. How big air switch does Gree 3-phase 3pi air conditioner use I have an air switch, but I don't know how to explain. Can I use it
13. Dear electricians, when the total power of electrical appliances in the room is high, do you need to use the air switch of C63? The original C40 sometimes jumps, several times a night, but rarely all the big appliances are used together? Is it possible to jump even if there is a short circuit of electrical appliances? I've calculated that when the main switch C40 jumps, the total load of electrical appliances in the room will never exceed 5kW. Moreover, the air conditioner and electric water heater are controlled by C16 and C20 first. It's strange that these small air switches don't jump. They jump the main switch as soon as they jump. What's the matter?
14. The brightness of 20W high efficiency energy-saving lamp is equivalent to 100W incandescent lamp. Four 100W incandescent lamps in a household all use this energy-saving lamp. If they are used for 5 hours a day on average, they can save electricity in 30 days______ It can save electricity______ 5 yuan / kW · h)
15. How to convert the formula of electric energy: 1 degree = 1 kwh = 3.6 * 10 ^ 6 joules
16. There is a "220 V 500 W" electric furnace, connected to the 220 V circuit, 0.4 hours to consume --- degree of electricity, the current through the circuit wire is --- A, the current in 1 s to do --- work
17. The resistance of a bulb is 440 ohm, which is connected to the lighting circuit, and the current through the bulb is 440 ohm____ A. Power on 1H, this bulb consumes a lot of energy___ Electric energy of J The formula and process should be used
18. When someone is using an electric iron, in order to facilitate ironing and not make the temperature rise too high, the electric iron is usually connected to the circuit as shown in the figure. When should the switch s be closed and opened? What are the benefits of doing this?
19. Human life needs energy. The following energy is mainly produced by chemical changes A. The heat required by electric kettle to boil water B. the electric energy generated by hydropower station using hydraulic power c. the heat energy generated by the burning alcohol lamp D. the wind energy used by wind power station
20. Is the power consumption of a 2W resistor 2W? If so, is the power consumption of 100 resistors connected in series 200W?