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When a resistor is connected to a circuit, the consumed power is 110W. When 3C charge is passed, 330j of electric energy is converted into internal energy, then () A. The voltage applied to the resistor is 330vb. The current through the resistor is 1Ac. The power on time of the resistor is 3SD. The resistance value of the resistor is 110 Ω
A. According to w = Qu, there are: u = WQ = 330j3c = 110V, so a is wrong; B, according to P = UI, current: I = Pu = 110w110v = 1a, so B is correct; C, according to q = it, time: T = Qi = 3c1a = 3S, so C is correct; D, according to ohmic law, electric
When a fluorescent lamp is connected to the lighting circuit and works normally, its current is 0.13a. If it is powered on for 10min, there will be a problem______ J's electricity is converted into heat and energy______ Yes
Through the filament current I = 0.13a, lighting circuit voltage U = 220V, power on time t = 10min = 600s, according to the formula w = Pt. P = UI, we can deduce w = uit. Substituting the above figures, we can get w = 220V × 0.13a × 600s = 17160j. Then 17160j of electric energy is converted into heat energy and light energy
How to calculate the voltage, current, power and resistance
For example, how much current is 200V 60W, and how much current is 50V 60W
Voltage x current = power
Voltage △ resistance = current
Current x resistance = voltage
60W △ 220V = 0.272a ----- 60W / 220V bulb current 0.272a
60W △ 50V = 1.2A -------- 60W / 50V bulb current 1.2A
Power calculation of resistance hybrid circuit
When doing a certain experiment, we need a 500 ohm, 1 watt resistance element, but now there are only 1 / 4 watt 250 ohm, 1K ohm, 2K ohm resistance elements. How to solve this problem?
Is this the only one on the first floor?
It seems that this is the only one, and none of the others is good
There are not so many ways to solve this problem. Although the method of the first floor is right, it is not only to meet the problem of power and resistance. R = 500 Ω, R1 = 250 Ω, R2 = 1000 Ω, R3 = 2000 Ω. Through calculation, we can get the following corresponding relationship R R1 R2 r3i √ 2I / 2 √ 2I / 4 I / 4U 2 √ 2U √ 2U on u
RELATED INFORMATIONS
- 1. When calculating the power of resistance and the current and resistance in closed circuit, why are the relevant formulas pure resistance If the non pure resistance does not conform to Ohm's law, please explain why
- 2. The calculation of the voltage in the circuit with resistor diodes and light emitting diodes in series In 12V DC power supply circuit, 1K resistor, diode 4007 and a LED are connected in series, how much is the circuit current, how much is the voltage at both ends of the diode and the LED, and how much is the voltage at both ends of the LED Is the voltage drop of the diode the terminal voltage at both ends of the diode?
- 3. Using 5.5V voltage with 3V 20mA LED bulb resistance value Should I use a resistor with U / I = R (5.5 / 0.02 = 275), or a resistor with (input voltage output voltage) / current = (5.5-3) / 0.020 = 125 ohm, or some other resistor? Give me a value and the solution to this problem in the future,
- 4. How much resistance does it take to connect 1 LED (light emitting diode) in series with 24 V voltage
- 5. The voltage at both ends of the small bulb is 3.8V, and the current passing through is 0.3A. Within 10min, the current does work on -- J and consumes -- J's electric energy To get the formula, the process
- 6. If the light bulb is short circuited, does the voltmeter and ammeter show the number?
- 7. What is open circuit, short circuit, open circuit? How to know whether the bulb is short circuit or open circuit? What about the series connection of voltmeter? What about the parallel connection of ammeter? It's junior high school science knowledge
- 8. In the series circuit, a bulb short circuit or open circuit, how does the voltmeter and ammeter change, and in the parallel circuit, how does the ammeter and the voltmeter change
- 9. The ammeter is out of order. There is a voltmeter. How to measure the rated power of the bulb
- 10. When measuring the electric power of small bulb, considering that the ammeter and voltmeter have certain resistance, should the measured value of electric power of small bulb be larger than the real value
- 11. Why is the total electric power divided by the supply voltage not equal to the circuit current in a series circuit? Why is the power divided by the voltage not equal to the circuit current?
- 12. How to calculate the total power when the current and voltage of three-phase electricity are known/
- 13. Current calculation of three phase electricity According to the formula P = 1.73ui Then the three-phase current is 98.110.105 respectively. How to calculate the power In addition, there is a 400v30kw51.4a generator. Does 51.4a mean that each phase can carry 51.4a current
- 14. When two resistors are connected in parallel, please tell us the distribution law of their current and electric power
- 15. In the home circuit, what is the device that shows how much electricity is used?
- 16. Problems in the chapter of home circuit in Physics There is a voltage of 220 V between the live line and the zero line, not between the zero line and the ground, and not between the ground and the ground. Why? It is said in the book that the zero line is connected to the ground, and then the ground is grounded. I don't quite understand. Who can explain this voltage. But isn't the home circuit AC? Can't the current pass through the zero line? At this time, it has no voltage? And, Is it OK to touch the zero line when you get an electric shock? Does the zero line also have current? It's better to have a circuit diagram to explain If the zero line forms a loop with the live line, why does it have no voltage and current
- 17. When the switch is closed, the light doesn't work, but the fuse is blown immediately. The reason for this phenomenon may be () A. There is an open circuit somewhere in the circuit B. connect one end of the switch to the neutral line and one end to the live line C. connect the switch to the neutral line D. the voltage in the circuit is too low
- 18. Exercises of physical circuit diagram in grade three of junior high school
- 19. If the filament of the bulb in the home circuit is broken, and the insulation of the wire is damaged, you should choose the method of maintaining the circuit A. Replace the bulb B. replace the fuse C. replace the wire and connect it D. replace the switch
- 20. Physical home circuit problems In the evening, plug the desk lamp into the socket beside the desk. When the desk lamp switch is closed, the desk lamp doesn't light up. Plug the desk lamp into other teahouses, and find that the desk lamp can light up normally. Insert the pen into the socket hole beside the desk for inspection, and find that one of the holes can make the pen neon. What's the cause of the failure?