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The voltmeter should be connected in parallel with the measured appliance,
Because the internal resistance of the voltmeter is very high, the current through the voltmeter is very small and can be ignored
Why should the voltmeter be connected in parallel with the tested appliance
Because the resistance of the voltmeter is very large, when it is paralleled, the output current is the smallest and the error influence is the smallest
At the same time, all electrical appliances, only when parallel, parallel voltage is equal, voltmeter is reflected through its own voltage, to reflect the parallel voltage of the measured electrical appliances. At this time, the voltage of the measured electrical appliances will be the most real
In the circuit, the voltmeter measures the voltage at both ends of the appliance. When the appliance is short circuited, does the voltmeter show the number? When the appliance is short circuited, does the voltmeter show the number?
Is there any indication in case of open circuit?
When the circuit is open, the voltmeter indicates the power supply voltage
There is no indication in case of short circuit
RELATED INFORMATIONS
- 1. If the voltmeter is connected in parallel with the consumer and power supply, whose voltage is measured by the voltmeter
- 2. 12V / 2A regulated power supply is out of order. It can be replaced by 12V / 1.2A regulated power supply, but will it damage electrical appliances?
- 3. The consumer with resistance R is connected to the power supply, and the current passing through the consumer is I, so that the current passing through the consumer is reduced to 1 / 3 of the original. A () resistor should be connected to the consumer in series
- 4. The bulb is marked with PZ 220 V 100 W, which is connected to 220 V power supply. What is the actual power
- 5. There is a light bulb marked with 220 V, 100 W (1) The bulb is normally emitting. What is the current passing through the bulb? What is the resistance of the bulb? (2) How much power is consumed when the bulb works normally for 10 minutes?
- 6. Find the maximum power of load resistor RL in the circuit below
- 7. When the power supply voltage is fixed, the load with large resistance is a large load? Isn't it true that the size of the load is only related to the current? I remember the book said that the load with large current is called large load, so in the series circuit, the current is equal everywhere, and there will be different loads?
- 8. The equivalent resistance of the two terminal network is 10 ohm, the open circuit voltage is 40 V, and the maximum power consumed by the load is?
- 9. The same voltage power supply in parallel, in each power supply in series with a very small resistor can balance the current, what is the principle? Several power supplies of the same voltage are connected in parallel to provide large current. A small resistor in series on each power supply can balance the current. What is the principle? Now I also want to prevent one of the power supplies from breaking down and affecting other power supplies. Therefore, a diode is connected to each power supply, and the diode also has a certain resistance. Can it not only prevent the current from flowing back, but also balance the current? Can diode be connected in series instead of resistor? I know that the purpose is to prevent the current from flowing back, but what is the principle to facilitate my future use,
- 10. Ohm's law of the whole circuit points out that the current in the circuit is determined by the internal resistance of the power supply and the load resistance A power B voltage C resistance D electromotive force,
- 11. The current comes out from the positive pole of the power supply and then goes through the consumer. Is it connected to the positive pole or negative pole of the consumer
- 12. What is the difference between the total power and the output power of the power supply? How to calculate the maximum output power?
- 13. The open circuit voltage and short circuit current of the two terminal network are 10V and 2A respectively When the open circuit voltage of two terminal network is 10V and the short circuit current is 2a, it is equivalent to voltage source and the electromotive force is 0___ 5. The internal resistance is___
- 14. Knowledge network diagram of voltage and resistance I need it urgently Friends, hurry up, OK 5:30 am at the latest
- 15. It is known that R1 = 3 Ω and R2 = 6 Ω are connected in parallel, and the main circuit current is 1.5 A. what is the voltage of each resistor
- 16. A capacitor and a resistor are connected in series on the 220 V AC power supply. It is known that the voltage drop on the resistor is 120 V, so what is the voltage on the capacitor
- 17. An active two terminal network with open circuit voltage of 12V and short circuit current of 2A has been measured_____ ?
- 18. The open circuit voltage of an active linear two port network is 20 v. if it is connected to a five ohm resistor, a two ampere current will be generated The open circuit voltage of an active linear two port network is 20 v. if it is connected to a five ohm resistor, a two ampere current will be generated. The Thevenin equivalent circuit of the two port network can be obtained!
- 19. There is a passive two terminal network. When u = 10V, I = 2A. It is known that the resistance network is composed of four 3 Ω resistors. How are the four resistors connected?
- 20. A solar panel, under normal illumination, has a voltage of 12V and a short-circuit current of 36ma (short-circuit current is the ammeter connected in series with the solar panel) ）A 5 ohm fixed value resistor is connected in series with the solar panel, and the voltage and current of the fixed value resistor are the reasons