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How to change a 12 V AC transformer into an 11 V DC charger? (battery voltage: 11 V, current: 3.6 a)
Connect 12V AC to bridge rectifier, add 1000uf / 25V capacitor filter, and connect a 2 ohm Power 3W wire wound resistor in series to limit current
What does it take to charge a 12 volt battery?
The first 12V full, must be 14 - 15V DC power supply
Second, it depends on the capacity of your battery to choose the right power supply and get the right charging current, otherwise your charging power supply will burn down due to the high charging current
In the circuit with 2.4kw power and 220 V supply voltage, can we choose a fuse with 10A fusing current?
This is a physics problem,
I = P / u = 2400 / 220 = 10.91 > fuse 10A current
So it can't be used
RELATED INFORMATIONS
- 1. In the circuit with 2.4kw power and 220 V supply voltage, the fuse with 6 a fusing current can be selected______ (judge right or wrong)
- 2. What is the resistance of an electric appliance with 1.5KW heating tube and 220V voltage?
- 3. In a series circuit, when there are multiple electrical appliances, how does the current change when one resistance is constant and one resistance is increased? Is the current of series circuit determined by the large resistance? Or is the resistance small?
- 4. If the voltage at both ends of a certain section of circuit is constant, when 10 Ω resistor is connected, the current passing through is 1.5A; if 25 Ω resistor is used to replace 10 Ω resistor, the current passing through ↓ of the circuit will be 1.5A The current is____ The voltage at both ends of the circuit is____ .
- 5. The resistance of an electrical appliance is 120 ohm. How many ohm resistance should be connected in parallel with the electrical appliance to make 185 / 5 of the total current in the circuit pass through the electrical appliance? If the voltage at both ends of the electrical appliance is 185 / 5 of the total voltage, how many ohm resistance should be connected in series with the electrical appliance?
- 6. The working current of an electric appliance is 0.5 A, and it consumes 66000 J of electric energy in 10 min
- 7. A constant resistance is marked with 10 Ω 1 A. if it is connected to both ends of a 12 V circuit and works normally, how to connect a large resistance in the circuit? A constant resistance is marked with "10 Ω 1 a". If it is connected to both ends of a 12 V circuit and works normally, how to connect a large resistance in the circuit? If it is used in parallel with a resistor marked "20 Ω 1.5 a", what is the maximum voltage that can be applied to the circuit?
- 8. The resistance of an electrical appliance is 484 ohm, and the rated voltage is 220 v. how much work has been done by the current when the electrical appliance is connected to the circuit and works normally for 5 hours? How many kilowatt hours of electric energy is consumed?
- 9. A 4-ohm resistor is connected in series with a consumer on a 6V power supply. Now we only know that the actual power of the consumer is 2W, so the current passing through the consumer may be () A 2A B 1A C 0.5A D 0.25A how do I calculate B and C? Are they all right? Is this the question for senior high school entrance examination Big brother and big sister will come and help me. I'm in urgent need. Has anyone seen it? Tell me where it is in the middle school entrance examination
- 10. There are two resistors in parallel in the circuit, and the current flowing through the main circuit is 0.5A. If the resistance value of one resistor is increased by 10 ohm, If the resistance of the other resistor increases by 10 Ω, the current of the main circuit will decrease by 0.05A. Calculate the power supply voltage and the resistance of the two resistors!
- 11. Rated voltage: 220 V rated power: 500 W rated frequency: 50 Hz what resistance is used? What's the color of one ring of four-color ring? What's the color of two ring, three ring, four ring? Or what's the resistance?
- 12. How many watts is the host power supply 220 V 4.0 a 50 Hz
- 13. How much W is 220 V / 50 Hz / 3A?
- 14. It takes 6 minutes for a 1.8L electric kettle to boil a full kettle of water. The power is 1300w.220v and 50Hz. How many kilowatts of electricity is needed to boil a kettle of water? How to calculate?
- 15. A Y, yn connection, 560kva, 10000 / 400V three-phase transformer is specially used for lighting. If the incandescent lamp is 100W, 220V, how many lamps can be connected to the three-phase? The solution is very simple, Sn / P = n, do you have a good idea? I still don't understand the meaning of the problem. If the lamp is connected to the secondary side, it must be connected to the secondary side, as long as the total rated current of the lamp is connected, It's OK to reach the required current of the secondary side, but it's different from the answer. The answer is 5600
- 16. What's the difference between fluorescent lamp and incandescent lamp? What's the difference in the principle of luminescence? Make it clear!
- 17. The 220 V lighting circuit is connected with 10 60 W incandescent lamps, 10 40 W fluorescent lamps, 10 trial calculation branch I and circuit I (fluorescent lamp P factor is 0.5, ballast active power P loss is 8 W)
- 18. How to distinguish incandescent lamp from fluorescent lamp? Don't move the advanced one out. Explain how to distinguish it
- 19. Current carrying algorithm of copper wire Generally, the safe current carrying capacity of copper conductor is 5-8a / mm2, and that of aluminum conductor is 3-5a / mm2 For example: The recommended safe current carrying capacity of 1.5mm2bvv copper conductor is 1.5 × 8A / mm2 = 12a The recommended safe current carrying capacity of 2.5mm2bvv copper conductor is 2.5 × 8A / mm2 = 20A The recommended safe current carrying capacity of 4mm2bvv copper conductor is 4 × 8A / mm2 = 32A Why add BVV copper wire? Is it OK for me to calculate the current carrying capacity of copper wire in the future according to the above? But I see that there is a formula algorithm. Are these two the same
- 20. How to calculate the current and power of 380V three phase circuit (electric heating circuit) For example, if the power is 10kW, how much is the current? Just give a specific formula and result