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In refitting the ammeter, wouldn't it be short circuited by connecting a resistor to the ammeter
In refitting ammeter, connecting a resistance to the ammeter will not short circuit the ammeter. Only connecting a wire to the ammeter will short circuit the ammeter
The purpose of this is to increase the range of the ammeter so that it can measure more current
When measuring the resistance with voltammetry, how to know the short circuit or short circuit of the bulb through the ammeter and voltmeter
It can be divided into the following two situations:
If the small bulb doesn't light up and the voltage indication is close to the power supply voltage, the filament of the small bulb is broken or the terminal is in poor contact
If the small bulb doesn't light, the voltmeter doesn't show the number, and the current shows a large number, the bulb is short circuited
A power supply, a switch s, an ammeter, a constant resistance R and a sliding rheostat are connected in series in the circuit, and a voltmeter measures the voltage at both ends of R
When s is closed and slide plate P of sliding rheostat slides to the right, the voltage indication will decrease_______ The current represents the number______ The ratio of voltage representation to current representation_____ (choose "larger", "smaller" or "unchanged")
LZ doesn't give the figure, how can we know how to access the sliding rheostat=
The characteristic of the ammeter is that the resistance is very high, which is usually equivalent to that of the voltmeter?
Small, large wire, open circuit
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- 2. An ammeter is equivalent to a wire. What is a voltmeter equivalent to?
- 3. In the circuit, what are the burnt out appliances, ammeters and voltmeters equivalent to? Are they wires or switches?
- 4. 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?
- 5. 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
- 6. 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
- 7. 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?
- 8. 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?
- 9. 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
- 10. When a wire passes the current of 0.5A for 10s, the amount of charge passing through the wire is
- 11. 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?
- 12. Physics and electricity in Junior Three
- 13. 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?
- 14. 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?
- 15. 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
- 16. 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
- 17. 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
- 18. 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?
- 19. In the series circuit, if one bulb is removed (there are multiple bulbs), will the total current change and the total voltage change?
- 20. Is there any relationship between the current and the cross-section of the wire? If the material is the same and the length is the same, only the cross-sectional area is different I = nesv