![](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>)
Is the motor and resistance wire in the hair dryer in series or in parallel
All the brothers upstairs are very funny
If it is parallel, how will the fan speed change?
The heating wire and the fan are connected in series, but the resistance wire is divided into two sections. At low temperature, the two sections of the heating wire are connected in series with the fan motor and a rectifier diode. At this time, the resistance of the circuit is large and the current is small, so the heat is small and the fan speed is low. At high temperature, a section of the heating wire is cut off by the switch. At this time, the resistance of the circuit is small and the current is large, so the heat is high and the fan speed is fast
What is the resistance value of hair dryer resistance wire?
The power is 500W ~ 1000W. The resistance is about 48 ohm ~ 100 ohm. Note that if there is temperature change, there is a diode in series; if there is cold air, there is a group of resistance wires with large resistance in series
RELATED INFORMATIONS
- 1. What is the heating rate of the electric heating wire in the hair dryer
- 2. One day, Xiao Ming found that an old incandescent lamp marked "220 V & nbsp; & nbsp; 40 W" was dim. He ran to the corridor to observe the electric energy meter, and measured the electric power of 1200 W with his watch. (1) "it can't be the electric power of the incandescent lamp!" Xiaoming checked that the reading and calculation were correct, and the watt hour meter and watch were accurate. With the help of his father, the voltage at both ends of the incandescent lamp was measured to be 220 v. please analyze the cause of this error______ (2) after analyzing the cause and correcting the error, Xiao Ming measured again that the electric power of this lamp is 36W. The reason why the actual power of the incandescent lamp is lower than the rated power is that______ ．
- 3. To connect a small bulb marked with "6v-30w" to 18V power supply for normal lighting, what is the resistance in series? What is the electric power of the resistance?
- 4. How long does it take to make 80kg water from 20 ℃ to 55 ℃ with the electric heater of "220V 1.8kw" fast
- 5. It is known that R1 = 10 Ω, R2 = 20 Ω. If they are connected in series and connected to a 6V power supply, the power consumption of resistor R1 and R2 per minute is If they are connected to the same power supply, the work done by the current to r1r2 per minute is
- 6. The electromotive force of the power supply is 2V and the internal resistance is 0.1 ohm. When the external circuit is open, the current and terminal voltage in the circuit are
- 7. Generally speaking, when the load resistance decreases, the load increases, and the power output power increases (×), how to explain
- 8. A small electric bell with a resistance of 10 ohm is connected in series with a fixed resistance of 20 ohm and connected to a 6V power supply. If the small electric bell just works normally, what is the voltage at both ends of the electric bell?
- 9. There are three resistors, R1 = 8 ohm, R2 = 12 ohm, R3 = 20 ohm. Connect them in series with a 10 volt power supply. What is the voltage at both ends of the three resistors?
- 10. If resistance R1 is connected to a circuit, the power consumed is P1; if another resistance R2 is connected to the same circuit in series, the power consumed by R2 is P2. If P1: P2 = 4:1, R1 "select" greater than "," less than ", or" equal to "R2
- 11. If you want to change the hair dryer to make the temperature of hot air higher, you should connect a resistance wire to the original resistance wire
- 12. What kind of energy does a hair dryer turn into when it blows cold air
- 13. What is the electric power of the bulb marked with "3V 3W" when passing 0.2A current?
- 14. A lamp is connected to the home circuit. The current passing through is 0.2A. How about the electric power of the lamp?
- 15. Do you need to adjust the ohm to zero after measuring the resistance of 4 ohm and 5 ohm with the ohm gear of the multimeter Do you need to adjust the ohm to zero after measuring the resistance of 4 ohm and 5 ohm respectively with the ohm gear of the multimeter
- 16. Physics problems about Joule's law The unit length of a wire is 0.01 Ω / m, which is now used for household circuit power supply. The resistance of the electric furnace at 100m is about 48 Ω. How much heat does the wire generate per minute? If the electric furnace is short circuited, how much heat does the wire generate per second?
- 17. What about Joule Lenz's law? 1: Is Joule Lenz's law a person? 2: Joule Lenz law I read in a book that the heat generated by a circuit is directly proportional to the square of the current intensity, the resistance, and the time of the current flowing. Later, I thought, it's not quite right. First, in a circuit, of course, the larger the resistance is, the greater the heat generated, the smaller the line resistance is, the smaller the power transmission is, and the smaller the loss is. Of course, the smaller the heat generated, but on the other hand, for example, the electric furnace, The smaller the resistance of the electric furnace wire, the greater the power, and the greater the heat generated. How can it be reversed?
- 18. When the sliding rheostat R is adjusted and the motor is stopped, the indication of ammeter and voltmeter are 0.50a and 2.0V respectively. When R is re adjusted and the motor returns to normal operation, the indication of ammeter and voltmeter are 2.0A and 24.0V respectively. Then the output power and internal resistance of the motor are normal They are () A. 32W and 4 Ω B. 48W and 4 Ω C. 32W and 12 Ω D. 48W and 12 Ω
- 19. The object with mass m stands still on a smooth horizontal plane and is subjected to a horizontal force from the moment t = 0. The relationship between the magnitude of the force F and the time t is shown in the figure. If the direction of the force remains unchanged, then () A. The instantaneous power at 3t0 is 5f02t0mb. The instantaneous power at 3t0 is 15f02t0mc. The average power of horizontal force is 23f02t04md from t = 0 to 3t0. The average power of horizontal force is 25f02t06m from t = 0 to 3t0
- 20. Joule to megajoule conversion How many million kilojoules is 648 million joules