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If the power supply is short circuited, the voltmeter will be connected in parallel at both ends. Will the voltmeter be burnt out and display the power supply voltage
The voltmeter is connected in parallel at both ends of the short circuit power supply. There is no current passing through the voltmeter and the voltmeter does not work, so it will neither burn out nor realize the power supply voltage
Can the ammeter be directly connected to the power supply? Can the voltmeter?
The ammeter is equivalent to a wire, so it can't be directly connected to the two poles of the power supply
The voltmeter measures who is in parallel with whom, so it does not affect the circuit when it is connected into the circuit. The obstruction of the voltmeter to the current is particularly large, which is equivalent to an open circuit. It can be directly connected to both ends of the power supply to measure the power supply voltage
If the parallel pure resistance circuit is short circuited, what will happen to the voltmeter?
If there are many situations, please explain them one by one
It's not necessarily a purely resistive circuit. Sorry, I made a mistake! In addition, the internal resistance of power supply, line impedance and so on are considered.
This is a problem with many kinds of situations. The main reason is that how the line is connected is uncertain. 1. When the voltmeter is connected to the short-circuit resistance, it is no doubt 02. When the voltmeter is not connected to the short-circuit resistance and connected to the end of the road, the resistance of the external circuit decreases and the voltage indication decreases due to the short circuit
In the circuit, the voltmeter is connected in parallel with a bulb. If the bulb is short circuited, is the voltmeter also short circuited?
The short circuit of the bulb means that the electricity will be burned. Because the voltmeter is connected in parallel with the bulb, the voltmeter will not be short circuited or burned. To put it simply, it's like the electricity used by two neighbors is on the same transmission line. The next one is equivalent to parallel connection. However, if there is a short circuit of a bulb or other electrical appliances, at most it will burn his protection
RELATED INFORMATIONS
- 1. When the voltmeter is paralleled in the circuit under test, what are the consequences of open circuit and short circuit of the voltmeter to the circuit? Forget to say, what if the voltmeter is in series? There are two consequences
- 2. What determines the voltage at both ends of an ideal current source for circuit analysis What determines the voltage at both ends of an ideal current source The voltage at both ends of the ideal voltage source is determined by ()
- 3. Electrotechnics: the difference between power model and ideal voltage source and ideal current source When the three resistors are connected in series, the voltage and current of the resistor are independent of the voltage source and can be removed
- 4. Fill in the blank: ideal voltage source and ideal current source are connected in series, and their equivalent circuit is______ The ideal voltage source and resistor are connected in parallel, and its equivalent circuit is_____ .
- 5. Why is capacitor equivalent to short circuit at the moment of power on?
- 6. How to judge whether the circuit is short circuit or open circuit from the presence of voltmeter and current indication Students said that in the series circuit, the small light bulb is not on. When the ammeter in series with the small light has a number, the small light is not normal. If the ammeter has no number, it means that the small light is OK. Is he right? Explain it. Thank you
- 7. What is the difference between voltage source and current source? Voltage source and current source are the same power supply. I don't know the difference between them. Please answer in detail. Thank you!
- 8. 1. If the external resistance of the ideal current source increases gradually, its terminal voltage () A. Gradually increase B. gradually decrease C. D. constant Better explain why
- 9. The b value of triode is the parameter reflecting the ability, which is () a voltage control voltage B current control voltage C voltage control current D current control current
- 10. Is electromotive force equal to supply voltage
- 11. What is the difference between power short circuit and electrical short circuit Short circuit why have cent power source short circuit and use electric appliance short circuit! What is the difference between them after all?
- 12. What's wrong with short circuit of power supply and electric appliance?
- 13. Can a short circuit burn out the power supply? If the total resistance of dry cell (3V) in parallel circuit is less than 0.1 Ω, can it burn out?
- 14. The electromotive force of the power supply is 3V, the internal resistance is 0.1, and the external resistance is 1.4
- 15. The electromotive force of the power supply is 3V, and the internal resistance is 0.2 Ω. When the external circuit is open, the current and terminal voltage in the circuit are
- 16. The electromotive force of the power supply is 1.5V, the internal resistance is 0.2 Ω, and the resistance of the external circuit is 1.3 Ω be deeply grateful
- 17. Connect two resistors of 12 and 40 ohm into the circuit. The total resistance is () ohm. When the current through 10 ohm resistor is 0.5 A, the power supply voltage is () V, the current through 40 ohm resistor is () a, and the main circuit current is () a
- 18. The internal resistance of the voltmeter is very large. The ordinary small bulb is equivalent to a wire. Why is it not short circuited when the voltmeter measures the voltage of the small bulb?
- 19. The voltage at the circuit end measured by Voltmeter is zero, which means that () 1 external circuit is open circuit, 2 external circuit is short circuit, 3 current on external circuit is relatively small, 4 resistance in circuit is zero
- 20. When the heater is not connected, the voltage is 210v. When the heater is connected, the voltage drops to 200V? In winter, after Li Ming plugged in the electric heater, he found that the light in the room was dim. He used a voltmeter to measure the power supply voltage. The result showed that the voltage was 210v when the heater was not connected. The voltage dropped to 200V when the heater was connected. The electric heater he used was marked with "220V, 1000W". From this, we can know the resistance of the power supply circuit__________ Ω, the actual power of the electric heater is____________ W. It's the resistance of the power supply circuit, not the resistance of the heater. 2.54 Ω, 826.4 w