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An ammeter is equivalent to a wire. What is a voltmeter equivalent to?
The resistance of ammeter is very small. When it is connected into the circuit, it has little effect on the total resistance of the circuit, so it can be regarded as pure wire in theory
The resistance of the voltmeter is very large. When other resistances in the circuit are small, the voltmeter can be regarded as cutting off the circuit, and the current flowing through the voltmeter is close to 0
An ammeter is equivalent to a wire. Is that a voltmeter?
Please note that the ammeter and voltmeter mentioned here are all in ideal state. The ammeter is equivalent to a wire, and the voltmeter can be regarded as an infinite resistance, that is, an open circuit. When the error or accurate calculation is to be considered, their internal resistance should be considered, such as the external method and the internal method for measuring resistance
Is voltmeter an electrical appliance or a wire in node method? What about ammeter?
Ignore the influence of the internal resistance of the meter. In the circuit, the voltmeter can be used as an open circuit and the ammeter as a short circuit. Or according to what you say, the voltmeter can be used as an electrical appliance with infinite resistance, and the ammeter can be used as a wire with zero resistance
If there is a short circuit of the appliance and the ammeter shows the number, then the voltmeter transformer wires at both ends of the appliance are connected in parallel
Isn't the voltmeter a disconnected circuit? How did it change the wire? If there were no other electrical appliances, would the power supply be short circuited?
The voltmeter can't cause a short circuit, because its resistance is very high. The short circuit must be the problem of the circuit
RELATED INFORMATIONS
- 1. In the circuit, what are the burnt out appliances, ammeters and voltmeters equivalent to? Are they wires or switches?
- 2. The resistance of an electric lamp is 10 ohm. The normal operation is that the voltage at both ends of the lamp should be 5 V, but the current power supply around us is 8 v How much resistance does it need to connect in series to make the lamp work normally?
- 3. When an unknown resistance is connected to the power supply in series with a 6 Ω resistance, its voltage at both ends is 4V; when it is connected to the same power supply in series with a 9 Ω resistance, its voltage at both ends is 3V
- 4. After a 3V, 15W small bulb is connected in series with a 2 ohm resistor, the small bulb lights up normally Seek 1: resistance R of small bulb 2: Voltage across resistor R2 3: If the small bulb is directly connected to the power supply, the small bulb will not be burnt out
- 5. As shown in the figure, the power supply voltage is 9V and remains unchanged, the range of the ammeter is 0 ~ 0.6A, and the resistance of the small bulb is 9 Ω, in order not to let the current in the circuit exceed the electric current What is the minimum value of sliding resistor in the circuit?
- 6. When 18V voltage is applied to a certain section of conductor, the current passing through it is 0.6A, then the resistance to the body is () ohm. If 9V voltage is applied to this section of conductor, the current passing through the conductor?
- 7. In the circuit shown in the figure, the resistance value of resistor R1 is 5 ohm, the current indication is 0.6A, and the voltage at both ends of resistor R2 is 2.5V Find the retention of & lt; 1 & gt; R1, the current of & lt; 2 & gt; R2, the resistance of R2, and the total resistance of & lt; 3 & gt; circuit
- 8. When a wire passes the current of 0.5A for 10s, the amount of charge passing through the wire is
- 9. 4V battery with 100 Ω resistance in parallel, the voltage is only 3.9v, what's the reason? Is it related to the current?
- 10. When the voltage at both ends of a resistor increases from 2V to 2.8V, the current through the resistor increases by 0.1A, then the resistance value of the resistor is () A. 8 Ω B. 20 Ω C. 28 Ω D. cannot be determined
- 11. How to judge which electric appliance or circuit is measured by Voltmeter and ammeter
- 12. In refitting the ammeter, wouldn't it be short circuited by connecting a resistor to the ammeter
- 13. Connect wires on both sides of the resistance, and the resistance is short circuited. It can be seen that the resistance is in parallel with that wire. Because the resistance of the wire is small, the current is low So is the current basically distributed to the wire? In fact, will there be a little current through the short-circuit resistor?
- 14. Physics and electricity in Junior Three
- 15. Electricity. It's very easy, that is, when there is a short circuit, does the voltmeter show the number and ammeter? Is it open circuit?
- 16. Short circuit / open circuit, is there current or voltage? When the circuit is short circuited, When the circuit is short circuited, When the circuit is open, When the circuit is open, Please give a specific answer So why is there current and no voltage when there is a short circuit? Is voltage not the cause of travel current? How can there be current without voltage?
- 17. There is a section of conductor. When the voltage at both ends is 2 V, the current passing through it is 0.5 A, and the resistance of this section of conductor is () A. if the applied voltage is zero, the current passing through it is () a, and the resistance of this section of conductor is () Ω
- 18. Give you a battery pack, two switches S1 and S2, two lights L1 and L2, and several wires. Design a circuit. Requirements: when S1 is closed only, L1 and L2 will light up; when S2 is closed only, L1 and L2 will not light up; when S1 and S2 are closed, L2 will not light up, L1 will light up, and it is bright
- 19. As shown in the figure, the circuit only needs to change the connection of one wire, so that the ammeter can measure the current passing through two bulbs at the same time, mark "×" on the wire to be connected, and then draw the wire to be connected
- 20. A copper wire and a nickel chromium alloy wire are of the same length and thickness. If they are connected in series in the circuit, which wire has the higher voltage at both ends? Which wire has the most current? Why?