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Why do wires with high resistance produce more heat
A wire is connected in series in a constant current circuit because the resistance of the wire multiplied by the square of the current flowing through it is the power consumption of the wire. According to Joule's law, more heat is generated
According to Ohm's law, the larger the resistance, the smaller the current flowing through the wire, and the current multiplied by the voltage, the lower the power consumption
Why is the wire hot and the wire not
The resistance of the wire is much larger than that of the wire, so the wire shares a large voltage under the same current, and the wire is not hot
How does an electric water heater convert electric energy into heat energy?
Electric water heater: there is an electric heating rod inside, through which electric energy is converted into internal energy (heat energy);
The main part of the electric heating rod is the resistance wire, which generates heat when it is electrified. If it is equipped with anti dry burning, the temperature switch will also be set in the electric heating rod
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Why is it wrong to say that "electric current transforms electric energy into heat energy through electric iron" in the statement that electric current does work?
I still can't understand that the electric iron is actually an electric heating wire. When the current passes through the electric heating wire, the electric energy is converted into heat energy. It seems that the meaning is the same!
I think it's right. The electric iron is a pure resistance circuit. The current will generate heat and the electric energy will be converted into heat energy. What's wrong?
Yes, the electric iron is the same as the electric heating wire. Isn't that what the thermal work equivalent of Joule is about? Besides, there is no other conversion of electric current. There is no light energy or mechanical energy. So the original one must be right. Believe it
RELATED INFORMATIONS
- 1. 32. An electric heater, with a resistance of 55 ohm, works with a current of 4 a passing through the heater. If it works for 300 seconds, the heat generated is____________________ Scorch
- 2. The higher the rated power in the home circuit, the smaller the resistance of the appliance, right
- 3. The more resistors in series, the less total power the circuit consumes? Doubt! The more the resistance in series, the greater the total resistance of the external circuit. Therefore, the smaller the main circuit current is, so the strain of the terminal voltage = E-IR is also large. Then, the total P = u ^ 2 / R, how to judge the total power reduction? I can't judge it P = e ^ 2 / R refers to the input power of the power supply. I'm talking about the total power consumed by the circuit. P=UI。 First floor, I seem to understand. But if the sum of the series resistances is less than the internal resistance of the power supply, the more series resistances, the less power the circuit consumes?
- 4. Is there a relationship between current and voltage and resistance in series circuit
- 5. In parallel circuit, if the resistance of branch increases, will the divided current increase or decrease?
- 6. When the voltage at both ends of an electric appliance is 6V, the electric energy consumed in 1min is 144j, and the power of the electric appliance is resistance value
- 7. When the voltage at both ends of a resistor increases to twice the original value, the power consumed by the resistor will become the original value in the same time______ Times
- 8. The relationship between filament resistance and temperature and why Thank you!
- 9. In the circuit as shown in the figure, the resistance R1 of lamp L1 is half of the resistance R2 of lamp L2 (regardless of the change of filament resistance with temperature), and the power supply voltage is 10V. When the switches S0 and S1 are closed and the switches S2 are disconnected, the lamp L1 lights normally, the electric power consumed by the resistance R3 is 2W, and the voltage expression number is U1; when the switches S2 are closed and the switches S1 and S0 are disconnected, the electric power consumed by the resistance R4 is 0.25W, The number of voltage is half U1. Calculate: (1) the ratio of two readings of ammeter; (2) the rated electric power of lamp L1; (3) the resistance of resistor R4
- 10. Does resistance change with temperature or does resistance change with temperature
- 11. An electric iron working at rated voltage has a power of 100W and a current of 454ma. What is the total rated power of the electric iron?
- 12. What is the difference between the rated current and the fusing current of a fuse? What is the difference between them? Which fuse should be compared with the maximum current in the home circuit?
- 13. A fuse with a rated current of 5A is installed on the circuit of? 220 V electric lamp. In this circuit, a fuse with a rated current of 40 W can be installed at most
- 14. The resistance of a 220 V 100 W incandescent lamp at room temperature is 40 ohm. What is the electric power at the moment of switching on
- 15. Three bulbs with different rated power and voltage are connected to the 220 V circuit respectively. Which bulb is brighter or the same? (please explain the reason)
- 16. Why is the light bulb dark during peak hours? (assuming the power supply voltage is constant, is it related to resistance?)
- 17. If the minimum resistance of the human body is 1200 Ω, what is the maximum voltage allowed to be applied to the human body
- 18. There is a large resistance in the test pen, which is used to limit the current passing through the human body The resistance of neon tube and human body is not taken into account. How big is the current flowing through human body when the pen is used?!
- 19. There must be a large resistance in the test pen to limit the current passing through the human body There must be a large resistance in the electric pen to limit the current passing through the human body. The resistance of the electric pen is 880k Ω. The resistance of the neon tube and the resistance of the human body are both small. How much current is flowing through the human body
- 20. What is the voltage of an ordinary dry battery? What is the voltage for human safety?