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Energy meters are used to measure energy______ A meter marked with "220V & nbsp; 5A" can be used for the meter with maximum power of 0______ Watt on the lighting circuit
① Watt hour meter is an instrument for measuring electric energy. ② the maximum power allowed by watt hour meter is p = UI = 220V × 5A = 1100W
How to ask the maximum power of household electrical appliances that the circuit can bear?
To write the calculation process with formula
Our family is generally 220 V single-phase electricity, generally you can calculate according to 1 kW power 3A current. If you want to be accurate, you can calculate according to current equal to voltage divided by resistance. After calculating the total current in the home, you can choose the cross-sectional area of the wire
What is the maximum total power of electrical appliances when the watt hour meter is connected to the circuit
The meter has the maximum allowable current, and the maximum power allowed to be connected is the current multiplied by 220
The words "2500r / kWh" are marked on the household electric energy meter. An indoor electric appliance works alone for 30 minutes, and the turntable turns for 50 turns_________
Power consumption w = 50R / (2500r / kWh) = 1 / 50kwh
t=30min=1/2h
The electric power of electric appliance is p = w / T = (1 / 50kwh) / (1 / 2H) = 1 / 25kW = 0.04kw = 40W
RELATED INFORMATIONS
- 1. The words "2500r / kWh" are marked on the household electric energy meter. If an indoor electric appliance works alone for 30 minutes and the turntable rotates for 50 turns, the consumption of the electric appliance is less than 50% If the power of the appliance is Watt, the working hour of the appliance consumes 1 kwh I hope brothers and sisters can give the calculation process
- 2. There is 3000r / kW. H on the dial of an electric energy meter. Use the electric energy meter and stopwatch to calculate the electric power of an electric lamp and let the lamp work independently, It takes three minutes to find out: (1) what is the electric energy consumed by the lamp? (2) the electric power of the lamp
- 3. A watt hour meter is marked with the word 3000kW. H. now it is observed that the watt hour meter rotates 45 times in 10 minutes. How much work has the current done?
- 4. An electric energy meter is installed on the home circuit. The turntable turns 180 turns in 2 hours An electric energy meter is installed on the home circuit (trunk road). The turntable of electric energy is measured to rotate 180 times within 2 hours. How many joules of electric energy are consumed by the appliance during this period? (the electric energy meter is marked with 600 revs / kW. H) Answer clearly
- 5. If the dial of the electric energy meter is marked with the words of 220V and 5A, the total power of the electric appliance that the electric energy meter can connect cannot exceed () kW
- 6. There is a "220v40w" light bulb A. how many can a "220v5a" electric energy meter connect to this kind of light?
- 7. What will happen if a small light bulb (2.5V 0.3A) and a household incandescent lamp (220V 40W) are connected in series to a 220V power supply? There are four options. What do you choose? A small light bulb and incandescent light bulb are on B small bulbs and incandescent lamps are burned out C small bulb short circuit, incandescent lamp normal light D small bulb burned out, incandescent lamp in good condition, but does not emit light Please talk about your ideas
- 8. What do the numbers in 3 * 4 * 1.5 (6) mean?
- 9. The meaning of 3 × 10 (40) a meter 1、 What do you mean by "3", "10" and "40" in the 3 × 10 (40) a meter? 2、 On the premise of safety, what is the maximum allowable power?
- 10. What does 10 (20) a mean on an energy meter?
- 11. What is the principle of the test button on the leakage protector
- 12. A copper wire with a cross-sectional area of 100 square millimeter weighs more than 1 meter The specific gravity of copper is 8.92 g / cm3. How heavy should a meter of wire be? Summer solstice is coming, man, I'm the same as you, but I'm wrong. What's the matter? The actual weight is much more than the theoretical weight
- 13. The conductor is a. glass plate B. rubber rod C. plastic rod D. copper wire
- 14. How to calculate the weight of 240 copper wire
- 15. What is the ten digit number of 1 + 11 + 111 + 1111. + 11.11 (thirty ones) = s
- 16. It is known that: as shown in the figure, the real numbers corresponding to points a, B, C and D are all integers. If point a corresponds to real number a, point B corresponds to real number B, and b-2a = 7, then the origin on the number axis should be______ Point
- 17. The positions of a, B and C on the number axis are shown in the figure below, which is simplified as follows: 1. |a + B | + |b-c | - A + C | 2. |2a-b | + |a-3c | - B + 3C| ———————|———|—|————|———————→ c a 0 b
- 18. The following statements are correct: (1) 0 is the number with the smallest absolute value; (2) the number whose absolute value is equal to itself is a positive number; (3) the numbers on both sides of the origin on the number axis are opposite to each other; (4) the absolute value is larger but smaller when compared with the two numbers A. 1 B. 2 C. 3 d. 4
- 19. The corresponding points of rational number ABC on the number axis are a, B and C, and their positions are shown in the figure below b
- 20. On the number axis, the distance from the point of √ 7 to the origin is equal to________ . Chapter 2 real numbers I'm going to use it tonight,