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In the home circuit, what is the device that shows how much electricity is used?
Electric energy meter.
How to verify the current action area of rcs931 power directional relay? Using protection tester
Do you have a manual on hand?
Logic diagram, action area should have
First, the sensitive angle is used for test, and then the current angle of fault value is changed step by step in two directions
In order to make sure that you can act at the first time, you can change the action time to 0 seconds, so that you can know whether it is an action immediately
To solve the problem of current and electric power,
The resistance of metal increases with the increase of temperature. When a bulb lights up, the temperature of the filament is very high, and the resistance of the filament is much greater than that when it doesn't light up. For example, when a "220 V 15 W" bulb lights up normally, the resistance of the filament is 3227 Ω, while when it is not connected to the circuit, it is only 310 Ω, What is the current through this bulb? What is the actual power?
At the moment when the circuit is connected, the resistance of the filament should be calculated at room temperature, that is 310 ohm, so the current is
220//310=0.71A
The actual power is
220*220/310=156W
The law of series parallel electric power in junior high school physics
Is the electric power like current voltage resistance in series parallel circuit has a certain rule
What is it all about?
In series circuit, the power is proportional to the resistance and inversely proportional to the parallel. The total power is equal to the sum of power
RELATED INFORMATIONS
- 1. When two resistors are connected in parallel, please tell us the distribution law of their current and electric power
- 2. 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
- 3. How to calculate the total power when the current and voltage of three-phase electricity are known/
- 4. 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?
- 5. 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
- 6. 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
- 7. 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?
- 8. 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,
- 9. How much resistance does it take to connect 1 LED (light emitting diode) in series with 24 V voltage
- 10. 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
- 11. 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
- 12. 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
- 13. Exercises of physical circuit diagram in grade three of junior high school
- 14. 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
- 15. 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?
- 16. What is the power 4HP on the motor
- 17. There is a DC motor. When it is connected to a circuit with a voltage of 0.2V, the motor will not rotate, and the measured current flowing through the motor is 0.4A. If it is connected to 2V, the motor will not rotate There is a DC motor. When it is connected to a circuit with a voltage of 0.2V, the motor will not rotate, and the measured current flowing through the motor is 0.4A. If it is connected to a circuit with a voltage of 2V, the motor will work normally, and the working current is 1a (1) The output power of the motor in normal operation (2) If the rotor is suddenly stuck during normal operation, what is the heating power of the motor at this time? There is a DC motor. When it is connected to the circuit of 0.2V voltage, the motor does not rotate, and the measured current flowing through the motor is 0.4A. If it is connected to 2V voltage, the motor will not rotate There is a DC motor. When it is connected to a circuit with a voltage of 0.2V, the motor will not rotate, and the measured current flowing through the motor is 0.4A. If it is connected to a circuit with a voltage of 2V, the motor will work normally, and the working current is 1a (1) The output power of the motor in normal operation (2) If the rotor is suddenly stuck during normal operation, what is the heating power of the motor?
- 18. There are both voltage source and current source in the circuit diagram In a closed loop, there is a resistor, then a current source and a voltage source. Does the series connection or parallel connection of the current source and the voltage source not affect the voltage or current of the resistor? When in series connection: is the current in the resistor the current of the current source? If the current value calculated by the formula I = u / R is not correct? When in parallel connection, is the current in the resistor the current of the current source, The voltage of resistance is the voltage source voltage? Is it wrong to calculate it with the formula? I'm dizzy, specialized in electronic technology
- 19. Calculating the power of resistance of voltage source and current source
- 20. Circuit voltage calculation problem Circuit... The power comes out and slides two pieces in the rheostat. One slide piece comes out and connects to the constant value resistor, the other resistance wire comes out and connects to the switch s, and then connects to the negative pole Constant resistance 80 Ω Sliding rheostat 240 Ω max Supply voltage 9.6V When the switch is off, the sliding rheostat will change from the minimum resistance to the maximum resistance, and the voltage at both ends of the resistor will change from? V to? V What happens when the switch is closed?