![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What is the law of series circuit voltage?
The total voltage at both ends of the series circuit is equal to the sum of the voltages at both ends of each consumer: solution: total voltage: u = ur1 + UR2 + UR3 + ur4 + (that is, the total voltage is equal to the sum of the series resistance voltages), ur1 = R1 / (R1 + R2 + R3 + R4 +...) *U (that is: the voltage of a single resistor is equal to the share of its own resistance in all resistors, and then multiplied by the total voltage), written by itself, not a network copy, hope to adopt!
Water dispenser is a kind of common household appliances, its working principle can be simplified as the circuit shown in the figure, in which s is a temperature control switch, R1 is a heating plate, when drinking
(1) (2) if the power of heating plate is 550W while the power of heating plate is 88W when the water dispenser is heated, calculate the resistance R2 (regardless of the influence of temperature)
The working principle of a water dispenser: one of the temperature control switches R1 is the heating plate. When the water dispenser is in the heating state, the water is quickly heated. When the preset temperature is reached, the switch s automatically switches to another gear, and the water dispenser is in the heat preservation state. (1) try to determine the corresponding working states of the water dispenser when the temperature control switch S is connected to a or B. (2) if the power of the heating plate is 550W when the water dispenser is heated, While the power of heating plate is 88W, the resistance value of resistance R2 is calculated
The working principle of a water dispenser: one of the temperature control switches R1 is the heating plate. When the water dispenser is in the heating state, the water is quickly heated. When the preset temperature is reached, the switch s automatically switches to another gear, and the water dispenser is in the heat preservation state. (1) try to determine the corresponding working states of the water dispenser when the temperature control switch S is connected to a or B
In the circuit diagram, what symbol is used to represent the temperature controller? What symbol is used to represent the corresponding contact point? What symbol is used to represent the electric heating wire,
What is the letter of thermostat in the circuit diagram
W: electronic temperature control is different from mechanical temperature control
It is known that the voltage at both ends of neon tube is at least 250V. When measuring the circuit of 220V, does neon tube emit light, interval light or continuous light?
Why?
It glows and continues to glow
RELATED INFORMATIONS
- 1. Check the home circuit. Install the bulb with rated voltage of 220 V to the position of the circuit breaker and remove the circuit breaker. After the switch is closed, the bulb will light normally It can be judged that the a circuit is completely correct There is a short circuit in circuit B Open circuit in C circuit D can't judge if there's a problem Analyze again. Be careful. Good score. Choose d first
- 2. A fan with a resistance of 4 ohm, working voltage of 220 V, measured working current of 5 A, calculated fan input power, fan thermal power, electric energy conversion machine Energy power
- 3. What is the function of the fuse on the knife switch? 0 - 14 days and 23 hours to the end of the problem A netizen said [knife switch can't protect household appliances at all. General household appliances have their own protection functions (such as over-voltage protection, over-current protection and under voltage protection). As long as they are operated normally, household appliances generally won't break down. The failure of household appliances is generally caused by their own quality problems, aging internal components, wrong operation of users and lightning] If according to this netizen's opinion, I match the fuse tube to the knife switch, its size and thickness? I don't know if this netizen's opinion is reasonable?
- 4. Current, voltage, resistance. Relationship with power /? Current, voltage, resistance. Relationship with power/
- 5. For example, some fans need 12V voltage, but the current is only 0.5A, the power is 6W, some fans only need 5V, but the current is 1.2A Now the question is how to control the voltage and current. Another is how to change the 220 V AC into 5 V output without heating Add 100 points after explanation And then there is the adjustment of the fan gear. It should not use the rheostat to divide the voltage. Is it to directly lower the voltage to make the current smaller? The power smaller? Is it slow? I mean, how do I do it for a fan? The same power can have different voltages and currents. Of course, I hope that the voltage is high and the current is low. Can I make a 220 V voltage with 0.01 a current How does the AC / DC module work
- 6. Is kinetic energy converted into electricity? How is kinetic energy transformed into electrical energy? What is the relationship between them? How is electrical energy transformed into kinetic energy?
- 7. How does the energy consumption braking of motor change the stored mechanical energy into electrical energy
- 8. There is a pump with a flow rate of 1200 cubic meters per hour, a lift of 38 meters and an efficiency of 80%. How to calculate its operating power and what is the calculation formula of pump power
- 9. How to express the formula of speed s of three-phase asynchronous motor?
- 10. Power capacitor current formula, such as 11 / root 3-334-1 capacitor, 11 / root 3 is the rated voltage, 334kvar, the meter measurement is 26.9 micro method current formula 11 divided by root 3 About 6.35, the unit is kV
- 11. The law of voltage in series circuit and parallel circuit,
- 12. Characteristics of series and parallel current and voltage
- 13. Characteristics of series circuit voltage expression characteristics of parallel circuit voltage expression——
- 14. Why is the voltage at both ends of each branch equal to the supply voltage in parallel circuit?
- 15. The internal resistance of an electric fan is 20 Ω. After connecting with the voltage of 220 V, the electric power consumed during normal operation is 66 W (1) What is the current passing through the electric fan motor during normal operation? (2) what is the power converted into mechanical energy and internal energy when the electric fan is working? What is the efficiency of the motor at this time? (3) if the electric fan blade is stuck and cannot rotate after the power is connected, how much is the current passing through the motor? How much is the electric power and heating power consumed by the motor?
- 16. Is 380V AC contactor coil 380V?
- 17. The power frequency AC voltage of 220 V and 380 V in engineering refers to its maximum value (a), instantaneous value (b), average value (c) and effective value (d)
- 18. University electrician! Under the condition of constant power supply voltage, if the triangle connection of the motor is wrongly connected into a star connection, or vice versa, what are the consequences?
- 19. The purpose of star delta Depressurization So the line current is a fixed value. The star phase current is equal to the line current, which is the value. The △ phase current is one third of this value. So the △ phase current is smaller
- 20. How many times of the line current of squirrel cage three-phase asynchronous motor when it is star connected is that when it is triangle connected?