How much is the current and voltage when charging the mobile phone battery
Charger voltage is generally 5V, the 5V after charging circuit into 4. 2V, and then charge the battery
The charging current of different mobile phones and batteries is not necessarily the same. Generally, the slow charging current is 0.1C (for example, if the battery is 1000mah, the charging current is about 100mA)
How to transform energy when fruit battery works
Conversion of chemical energy into electrical energy
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- 1. If you want to get higher voltage, you can connect multiple fruit batteries in series. Do you have to be the same fruit? Can you connect different fruit batteries in series? What's more, we need to write the experiment report about fruit battery. How should we write it? We haven't learned those formulas yet.
- 2. What's the relationship between the battery voltage of fruit? I remember watching a foreigner's video before. It seems that if you cut a fruit in half and connect these parts in series, it will double. Is it related to the number of batteries? By the way, what will happen if you connect the positive and negative stages directly to short circuit the battery of the fruit? Juice splashing?
- 3. Energy conversion windmill magnifier! What is the energy conversion of windmill and why? What is the energy conversion of magnifying glass and why?
- 4. How to make three blades of windmill model I plan to make a windmill model. Now, the blade is cut according to the size, but how can the blade of the plane be fixed?
- 5. What does thermal power plant use to generate electricity? A potential energy B electric energy C chemical energy D light energy
- 6. Are hydropower and wind power both mechanical energy to electrical energy?
- 7. Wind power is the same as hydroelectric power generation. It generates electricity by rotation. Now how does electricity have to rush to the point?
- 8. This paper analyzes the reasons of abundant hydropower resources in Three Gorges hydropower station and Longtan Hydropower Station
- 9. What is the generating power of the hydro generator? (g = 10N / kg)
- 10. The strong wind speed of a certain place is 14m / s, the air density is 1.3kg/m ^ 3, and the wind with cross-sectional area of 400m ^ 2 makes the wind turbine rotate, If 20% of its kinetic energy is converted into electric energy, how many watts of power is generated? (the air to the wind blade in T seconds is contained in a cylinder with s as the bottom area and L = VT in length)
- 11. A physics problem about electric energy, The figure (motor and heater wire in parallel) is a typical circuit of hair dryer with rated voltage of 220 v. the heater wire can generate heat after being electrified, and the motor can supply air after being electrified. It is known that the current passed by the motor is 0.5 A, and the resistance of the heater wire is 55 Ω Xiaoli uses a hair dryer to deliver hot air for 15 minutes every morning, and the unit price of electricity is [0.35 yuan / kW. H]. As far as the electric fan is concerned, how much is the electricity charge per month? How to calculate, had better have explain! Waiting to hand it in!
- 12. How does electric energy transform into other forms of energy From the micro point of view, how does electric energy transform into other forms of energy? Yes. It's electronic or something
- 13. The process of electric current passing through electrical appliances is to transfer the electric current__ Can be transformed into__ Energy process
- 14. Understanding knowledge of physical electricity The relationship between the brightness of a small light bulb and its electric power is very vague,
- 15. The relationship between the function of high school physics and electric energy There is a physics problem like this: There is a smooth metal frame with enough length placed vertically, the frame width is 0.5m, the frame resistance is ignored, the magnetic induction intensity of uniform magnetic field is 1t, the direction is perpendicular to the frame, the Mn resistance of metal bar is 1 ohm, the mass is 0.1kg, it releases without initial velocity and keeps good contact with the frame, and it falls vertically. During the process from release to maximum velocity, the charge passing through a section of the bar is 2C, Solution: electric energy generated in the loop during this process. (air resistance is not included, G is 10N / S2) I don't know how to solve this problem. I only know how to solve the problem of maximum speed, but I don't know the relationship between electric quantity and electric energy. Thank you very much for your help
- 16. In the section of electric energy transmission: if the topic only tells the output voltage, what is the output voltage? (complex circuit with lifting transformer) Output current and output power? When to use the circuit without transformer to solve the problem, when to use the circuit with voltage transformer to solve the problem?
- 17. Physics formula in the second semester of 2010 junior high school The second semester of 2010 Physical formula
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- 19. What's the difference between DN, Φ and de?
- 20. Urgent natural gas calorific value calculation formula, thank you!