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A 220 V, 1000 W electric kettle works for 30 min, how many kWh and j are consumed?
You have to know that a 1000W electric kettle consumes one degree of electricity in one hour. One degree of electricity is 3600000 joules. Half an hour is 1800000j
An electric iron is connected in the circuit of 220 V, and the current passing through it is 250 ma. If it is electrified for 1 hour, how much electric energy is consumed
W=Pt=3600*220*0.25=198000J
When an electric iron is connected to a 220 V circuit, it consumes 4620 J of electric energy per minute. At this time, the electric energy flowing through the electric iron is very low
w=UIt,I=w/Ut=0.37A
Connect a 220v200w electric fan, a TV set and an electric iron into the home circuit respectively. The power on time is the same. The current flows through them
Who has more heat?
I remember the heat formula is q = i2rt = Pt, I think it's the same
=The formula PT is only valid in pure resistance circuit. For TV and electric fan, it is obviously not pure resistance circuit. I think it can be understood that electric energy is the same, but TV and electric fan do not convert all electric energy into heat energy, and electric iron can be regarded as pure resistance circuit basically, so electric iron should generate the most heat
RELATED INFORMATIONS
- 1. 6. A bulb marked with "220V 100W" with rated voltage of_____ The rated power is____ The current through the bulb during normal operation For____ The resistance of the filament is____ Oh.
- 2. A bulb is connected in series with resistance R. the known bulb specification is "220V 1000W", the battery voltage is 220V, and the resistance of resistance R is 6.6ohm. Calculate the actual power of the bulb
- 3. If a 40v200w arc lamp is to be connected to a 220V lighting circuit, the R of series resistance should be several ohm
- 4. Two lamps with rated voltage of 220 V and power of 100 and 25 W respectively are connected in series in 380 V circuit Calculate the voltage distribution results of the two ends of the bulb respectively
- 5. The total power is 3 kW, and the rated voltage is 220 V for any calculation of the current
- 6. "When the voltage regulator is adjusted to 220 V, the power is 3 kW, and when the voltage is adjusted to lower, the power will be reduced along with it. (when the voltage is adjusted to 150 V, the power is 2 kW, and the power is adjusted to lower 110 V, the power is 1.5 kW." P=U*I=U*U/R=U2/R Power 3 kW at 220 V ------ 220 * 220 / 16 = 3025w When the power is reduced to 150V --- 150 * 150 / 16 = 1406w Reduce 110V power --- 110 * 110 / 16 = 757w It's different from what you calculated. Please advise
- 7. Circuit diagram of 220 V AC to 12 V DC Without voltage regulator IC, the diagram should be as simple as possible
- 8. In the 220 V lighting circuit, install the same color lamp, and the normal working voltage of each lamp is 13.5 v If a lamp is burned out, one is to give you an ammeter and a wire, and the other is to give you a voltmeter. How do two methods measure which lamp is broken?
- 9. How many kilowatts of electricity does a fan with voltage of 220 V ~ frequency of 50 Hz need to operate for 12 hours? Ceiling fan~
- 10. The capacitance of 10uF is connected with sinusoidal voltage with frequency of 50Hz and 5000Hz successively, and the effective value of voltage is 220V. The capacitive reactance and current of the capacitance in two cases are calculated
- 11. There is an electric kettle with the specification of "220V 1000W". When the electric kettle works normally, what is the resistance of the internal heating wire? 1. How long does it take to boil 1kg water at 20 ℃ under rated voltage? (excluding heat loss) 2. If the actual heating time is 6min, what is the thermal efficiency of the electric kettle?
- 12. If a bulb is marked with "220 V 100 W" and B bulb is marked with "220 40 W", then: (1) the ratio of resistance when both a and B bulbs are normally emitting R A: R B=_______ The ratio of current passing through is I a: I b=________ , the ratio of power consumption P A: P=_________ . (2) Connect a and B bulbs in series and connect them in a 220 V circuit. The voltage ratio at both ends of the two bulbs is u a: u B=_________ The brighter one is____ Light bulb: (3) Connect the two bulbs A and B in parallel in a 220 V circuit, and the current ratio at both ends of the two bulbs is I a: I b=________ The brighter one is____ Light bulb:
- 13. One degree of electricity can supply five "220 V, 40 W" electric lamps for several hours Thank you. The final answer is five hours
- 14. If L1, L2 and L3 are marked with "220V & nbsp; 100W", "110V & nbsp; 100W" and "36V & nbsp; & nbsp; 100W" respectively, and they all light normally, then () A. L1 is the brightest B. L2 is the brightest C. L3 & nbsp; is the brightest D
- 15. A lamp is marked with 220V 100W, B lamp is marked with 110V 100W, when they light up in their respective circuits, why do they consume the same amount of electric energy at the same time
- 16. The lamp L1 marked with 220 V, 100 W and the lamp L2 marked with 220 V, 25 W are connected in series in the same circuit, and they are actually eliminated The lamp L1 marked with 220 V, 100 W and the lamp L2 marked with 220 V, 25 W are connected in series in the same circuit. In order to ensure the safe use of the two lamps, what is the maximum voltage applied at both ends of the circuit
- 17. A 100W bulb and a 15W bulb are connected in series in a voltage of 220V (rated voltage). Which bulb is on and why
- 18. If the lamp marked with "220 V & nbsp; & nbsp; 100 W" is connected to the home circuit and energized for 1 hour, the work done by the current is______ J. Its resistance is______ Ω．
- 19. As shown in the figure, the specification of the electric iron is "220 V, 40 W". When s is closed, the electric iron works normally; when s is disconnected, the electric iron is in the preheating state. In order to make the power of the electric iron during preheating only 1 / 4 of the rated power, ask: (1) what kind of resistance should be selected? (2) how much electric power is consumed by the whole circuit during preheating
- 20. In the case of only 380V power supply, two incandescent lamps marked with 220V, 100W and 220V, 25W are used in series. What is the actual power consumption of these two bulbs [set filament resistance and rated state the same]