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A lamp marked with "220V 18W" is connected to the power supply If the current passing through the lamp is 1a, what is the actual power of the lamp? A18W B12W C8W D4W
A lamp marked with "220V 18W" has a rated current of 18 / 220 = 0.0818a. When it is connected to the power supply and the current passing through the lamp is 1a, the lamp will be damaged immediately, so the actual power is 0.0818a
The power is supplied to a lamp marked "PZ & nbsp; 220-60" in a distant construction site by a power supply of 220 v. due to the resistance of the wire, the actual power consumed by the bulb is 55 W. then the power consumed by the wire ()
A. Less than 5wb. Equal to 5wc. Greater than 5wd. Uncertain
If the wire resistance is ignored, that is, the voltage of 220 V is all connected to the bulb of "PZ & nbsp; 220-60", the bulb will light normally, and the power is 60 W; if the wire resistance is not ignored, that is, the resistance in the circuit will increase, and the total power consumed by the circuit will decrease, that is, less than 60 W, while the actual power of the bulb is 55 W, so the power on the wire can only be less than 5 W; therefore, select a
How many hours can a 1210 ohm electric lamp work normally when consuming 10 degree electric energy?
P=U²/R=（220V）²/1210Ω=40W
10 degrees = 10000w
10000w △ 40W = 250 (hours)
There is a 60W, 220 V incandescent lamp, connected to the 220 V power supply, ask: how many points through the incandescent lamp? How many hours consume 1 degree of electricity
1. In a pure resistance circuit, there is a formula: P = VI, then I = P / v = 60 / 220 = 0.273a
2. According to the formula w = Pt, (1 kilowatt hour electricity = 1000WH, meaning: 1 kilowatt hour electricity consumption is 1 kilowatt hour electricity)
T = w / P = 1000 / 60 = 16.667 H (16.667 hours)
RELATED INFORMATIONS
- 1. Connect the 220 V, 100 W small bulb to both ends of the 200 V power supply, can the small bulb work normally? What is the actual power of the bulb at this time?
- 2. If the brightest voltage of the lamp is 220 V and the working current is 0.18 a, what is the resistance of the filament when the voltage is 110 V If the title resistance or something is still unclear A is equal to 1222 B is equal to 611 C is greater than 1222 D is less than 1222
- 3. The rated voltage of electric iron is 220 V, the resistance working under the rated voltage is 1210 Ω, the rated power is calculated, and how much heat is there after passing through 10 minutes under the rated voltage?
- 4. The electric iron marked with "220 V, 50 W" is connected to the 220 V power supply, and the heat generated per minute is______ J. One hour power consumption______ Degree
- 5. An experimental group has made a "220 V & nbsp; & nbsp; 22 W" electric iron, which can produce heat every minute when used under rated voltage______ J. The resistance of the electric iron is______ Ω．
- 6. An electric heater marked with "220 V, 500 V" (commonly known as "fast heating") can generate heat of 15 minutes after normal operation___ J. If all the heat released by the electric heater is absorbed by water, under standard atmospheric pressure____ Heat 2kg water at 20 ℃ to boiling
- 7. The rated power of an electric rice cooker is 800W. It is known that cooking rice requires 4.8x10 quintic joules of heat. If the electric rice cooker does not consider the loss of energy during normal operation, how long does it take to cook rice with it?
- 8. There are nine fluorescent lamps, a water dispenser and a TV in the classroom. What are their connection methods?
- 9. The rated voltage of a DC motor is 220 V and the rated power is 5.5 kW. How big is the current when it works normally? What is the power consumption for 2 hours continuous operation?
- 10. Is the power consumption of a 2W resistor 2W? If so, is the power consumption of 100 resistors connected in series 200W?
- 11. When an electric lamp is connected to a 220 V power supply, its power is 100 W. if the power supply is connected to a long wire and then connected to the lamp, its power is 81 W, then the power consumed on the wire is 100 W______ W．
- 12. There is a festival lantern made of 20 small bulbs in series. If the current at the power plug is 200mA, then the current through each small bulb is 200mA______ mA．
- 13. Which lamp is brighter when it is connected to the 220 V power supply after it is connected in series with the 220 V 40W lamp A and the 220 V 100W lamp B
- 14. Connect two light bulbs marked with 220v100w and 220v60w in series to the 220 V power supply. What is their actual power,
- 15. Low voltage 24 V LED lamp connected to the protection of 220 V power supply will burn out
- 16. From the power supply with voltage of 220 V to an electric lamp marked "pz220-60" in a distant construction site, because the power supply wire has resistance The actual power consumed by the bulb is 55W. Then 1. The resistance of the filament? 2. The actual voltage at both ends of the bulb? 3. The electric power consumed by the wire?
- 17. In festivals, we install colored lights. Now we have dozens of colored light bulbs on hand. When we work, the voltage at both ends is not more than 6.3V. We can only use the home circuit to supply power. The feasible way is () A. Connect 34 lights in series to the circuit B. connect 34 lights in parallel to the circuit C. connect 35 lights in series to the circuit D. connect 35 lights in parallel to the circuit
- 18. The rated voltage of a color lamp is 36V. It needs to be connected to the circuit of 220V. How many such bulbs are connected in series to work normally Why is 220 divided by 36 equal to 7? Isn't 36 multiplied by 7 more than 220 V
- 19. Bulbs L1 and L2 are respectively marked with the words "220V 25W" and "220V 15W". If the two bulbs are connected in series and connected in the home circuit, the voltage ratio of the two lamps is______ What is the ratio of the current passing through______ What is the ratio of the actual power consumed______ The brighter light is______ If they are connected in parallel in a home circuit, the voltage ratio of the two lamps is______ What is the ratio of the current passing through______ What is the ratio of the actual power consumed______ The brighter light is______ ．
- 20. After connecting two "220 V, 60 W" bulbs in series and connecting them at both ends of the 220 V circuit, what is the actual total power of the two lamps?