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What is low carbon life (for example)? Why low carbon life? (behavior)
Low carbon life is a very environmentally friendly and civilized way of life. Saving water, electricity, oil and solar terms can help us turn low carbon life into reality
Now our country has made a public commitment to the world's emission reduction targets, and decided to reduce greenhouse gas emissions by 40% - 45% by 2020 compared with 2005. The low-carbon era has arrived, and is changing our lives
Connect two bulbs L1 and L2 with the same rated voltage in series into the circuit. After connecting the circuit, it is found that L1 should be brighter. Then the following judgment is correct ()
A. The resistance of L1 may be smaller than that of L2. B. the rated power of L1 may be larger than that of L2. C. If two lamps are connected into the circuit, L1 will be brighter. D. L1 will be darker when two lamps work normally
When the two lamps are connected in series, the current is equal, and L1 should be on, which means P1 > P2. From P = I2R, R1 > R2 can be obtained. If the rated voltage of the two lamps is equal, then p = u2r can know that P1 is less than P2, that is, L1 should be dark when the two lamps are working normally. If the two lamps are connected in parallel, then the voltage at both ends of the two lamps is equal. From P = u2r, we can know that L1's actual power is smaller, and the bulb should be darker
RELATED INFORMATIONS
- 1. The electric power of a bulb is 40W (= 40J / s)__________
- 2. Measure the power of the small bulb 1. What is the power of the small bulb marked with "2.5V 0.3A"________ W. To make it shine normally, it must be grounded______ V in the circuit 2. If a small bulb marked with "2.5V 0.3A" is connected to a 2V circuit and the measured current passing through it is 0.25A, then the rated power of the small bulb is_________ W. What is the actual power_________ W. 3. The brightness of the small bulb depends on () A. Voltage B. current C. actual power D. rated power
- 3. How to calculate the conversion power and mechanical power? How to calculate the motor energy conversion power η and the motor output mechanical power p?
- 4. The power of a machine is one kilowatt
- 5. What is the meaning of 20Pa?
- 6. What does 1W = 1J / s mean
- 7. What does resistance 100 / 1W mean
- 8. What is the physical meaning of Green's formula? How the line integral corresponds to the integral of the surrounding area is still incomprehensible geometrically and physically For example, how to understand this formula
- 9. The zero sequence reactance of transmission line is always larger than the positive sequence reactance. Is that right? Why? Thank you very much
- 10. Calculation method of zero sequence, positive sequence and negative sequence current?
- 11. Examples of low carbon life
- 12. After cutting off a section of the spring of an accurate spring scale, readjust the zero point, and then measure the gravity of the same object, the reading is compared with the original () A. Bigger B. smaller C. unchanged D. uncertain
- 13. Work and heat transfer are important for changing the internal energy of a body________ Yes, please reply,
- 14. A classic physics problem The teacher provided the following equipment: a constant voltage power supply (unknown voltage), a resistance Rx to be measured, a sliding rheostat (the maximum resistance is R0), an ammeter (or voltmeter) with appropriate range, two single pole switches, and several wires. Please select some of the equipment given to complete the resistance RX experiment with four different methods ① Draw the experimental circuit diagram ② Write out the main steps of the experiment ③ Write the expression of Rx
- 15. Physics problem -- quantum theory Pauli's incompatibility principle, 1) It is impossible to have more than two electrons in the same quantum state 2) It is impossible for more than two photons to be in the same quantum state 3) It is impossible to have more than two electrons in the same energy level, that is, with exactly the same energy 4) It is impossible to have more than two electrons in the same orbit with the same angular momentum The above sentences are right. Why are the others wrong? What's wrong? (multiple choice) There is no basis for the following facts 1) Positron, as the antiparticle of electron, was detected by Anderson in 1932 from the cloud chamber of cosmic ray. So the positron prediction was confirmed 2) Scientists observed a sea of particles in the cloud chamber 3) Electron pairs (negative) and positron can be excited from vacuum 4) Dirac imagines that the hole in the sea of electrons is a positron Say according to (single choice) The following statement is not accurate 1) The movement of micro material system does not meet the strict law of cause and effect, and does not conform to the principle of pure determinism 2) The motion of micro material system has statistical law 3) It is Einstein's expectation that the unified field theory of construction determinism can be used as a "complete" description of the objective material world 4) Einstein himself has been thinking for 50 years, but he is still trying to figure out what light quantum is and what the mechanism of quantum transition is, so he has always opposed the concept of quantum Single choice and give reasons By describing the structure of the electron shell, physicists began to describe the quantum state, and physicists began to clearly mark the quantum state 1) The quantum state of a microscopic particle is represented by a set of quantum numbers 2) Different quantum numbers lead to different quantum states 3) The angular momentum of the electron orbit can only be taken as some discrete values, and the direction is not specified 4) Each quantum number indicates that the corresponding mechanical quantity is quantized Single choice and give reasons
- 16. Why is Bohr's theory a semiclassical quantum theory
- 17. Classical physical selection Two short and thick pipes are connected on both sides of the container. They are bent upward to make two water sprayers. However, one of the nozzles shrinks into a nozzle, and the other nozzle is completely open A. the water flow from the big pipe is higher than that from the small pipe C both of the water jet is as high, C can't judge, please explain!
- 18. The main achievements of ancient physics in China
- 19. Achievements of physics in ancient China Don't need too complex, brief introduction, can introduce people and things clearly
- 20. The main factors affecting climate are a. latitude B. geomorphology C. atmospheric circulation D. land sea distribution But I'm wrong in choosing a