![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
When a bulb is connected to a 220 V circuit, the power consumed is 40 W? (2) What is the resistance of the filament? (3) How much energy is consumed when working for 10 minutes?
(1) From the deformation of P = UI, I = Pu = 40w220v = 0.18a answer: the current through the filament is 0.18a (2) from P = u2r, r = u2p = (220V) 240W = 1210 Ω answer: the resistance of the filament is 1210 Ω (3) w = Pt = 40W × 10min = 40 × 10 × 60s = 2.4 × 104j answer: working for 10min, the power consumption is 2.4 × 104
How much power does a 220 V, 700 w electric iron consume when it is plugged into a 110 V power supply? How to calculate?
First calculate the resistance of the electric iron
P = u ^ 2 / R, so r = u ^ 2 / P = 220 ^ 2 / 700 = 69.14 ohm
Actual power consumption P = u ^ 2 / r = 110 ^ 2 / 69.14 = 175W
A 220 V, 700 w electric iron, used in 110 V power supply, how much power it consumes? How to calculate, thank you
Power P = u ^ 2 / R
Now the input voltage is only half of the rated voltage
That's a quarter of the molecular square
The consumed power is one fourth of the rated power
So the answer is 175
How to calculate the power of a 220 v. 700 w electric iron when it is connected to 110 V power supply
220÷110=2
According to P = UI, 700 ÷ (2 × 2) = 175W
RELATED INFORMATIONS
- 1. After connecting the 220 V 60W bulb and the 220 V 40W bulb in series to the 220 V line, the 40 W bulb is brighter than the 100 W bulb. Right?
- 2. There are 10 "220 V, 40 V" electric lamps and 4 "220 V, 100 W" electric fans in the classroom. Question: 1. What is the total power when all the electrical appliances are working normally? 2. If you work 6 hours a day, how much kw'h of electric energy is consumed in a month (30 days)
- 3. Two "220 V 40 W" electric lamps are connected in parallel and then connected in the 110 V lighting circuit. The sum of the actual power of the two electric lamps is () A.20 W B.15W C.10W D.5W
- 4. Is the brightness of a 220 v.100 w incandescent lamp connected to a 220 V DC power supply the same as that of a 220 V AC power supply? Why?
- 5. An incandescent lamp marked with 220V 100W lights normally The resistance of an incandescent lamp marked with "220V 100W" is______ Ω; "220 V 100 W" incandescent lamp and "220 V 20 W" energy-saving lamp work normally with the same brightness. If both lamps work normally, they consume 1 kW and 8226; h electric energy respectively, and the energy-saving lamp works more than the incandescent lamp______ h. Energy saving lamp is more economical than incandescent lamp____ %The power of the power
- 6. Two electric lamps of "220 V 40 W" and "220 V 60 W" are connected in series and then connected in a 220 V circuit. The result is () A. The rated voltage of each bulb is reduced B. the actual power of each bulb is less than its rated power c. the rated power of each bulb is reduced D. the rated voltage of each bulb is less than its actual voltage
- 7. Help explain that the unit of work and energy is the definition of Joule I still don't understand the online version. Please help me to explain it again The explanation I read on the Internet is: the unit of work and energy is Joule. Joule is equivalent to a Newtonian force (n). The work done by the point of action moving one meter in the direction of the force is 1 joule = 1 N · M
- 8. How much damage can 160 joules of energy cause The strike energy of the arrow is 160 joules. How much damage can this cause?
- 9. There is 200ml alcohol in a glass bottle in the laboratory. The heat of alcohol in the bottle is 3 * 10 ^ 7 J / kg, and the known density of alcohol is 0.8 * 10 ^ 3kg / m ^ 3 1. How much heat can be released by burning alcohol completely 2. If only 16% of the heat is absorbed by water, how much heat is lost? 3. If all the lost heat is used, how many kg of water can be heated to 20 ℃ at normal temperature?
- 10. 1 joule plus minus 1 joule =?
- 11. For example, I need to know how large the I current is. According to the formula I = R / u, u is known as 220 V, R, R represents resistance
- 12. Why can't direct current kill people? Can alternating current kill people
- 13. What is the best charging voltage of 12V battery charger
- 14. What is 1000 Ma battery equivalent to?
- 15. How to calculate the discharge capacity of battery For example, a group of 48v10ah batteries discharge with 0.5c (5a) for 110 minutes. How to calculate its capacity?
- 16. The lithium battery used on the mobile phone is marked with 3.6V 900mAh, please estimate the value What is the energy stored in the battery case________
- 17. The lithium battery used in mobile phone is marked with "3.6V & nbsp; 900mA · H", where Ma · h is the unit of physical quantity charge. Please estimate the energy that this battery can store______ J．
- 18. How to speed up the electric vehicle with 48 V battery, 500W controller and 500W motor
- 19. Electric motor 500W 800W 1000W 1200W, with 48v20ah battery, what's the difference between speed and mileage?
- 20. Is it OK to charge the car battery with 12V electric car charger