What is open circuit, short circuit, open circuit? How to know whether the bulb is short circuit or open circuit? What about the series connection of voltmeter? What about the parallel connection of ammeter? It's junior high school science knowledge

You have many problems. 1. Open circuit: the circuit in which the user can work normally is called open circuit. Short circuit: when the user is not working due to short circuit, such as when the bulb is working, use a wire to connect the positive and negative poles of the bulb directly, At this time, due to the small resistance of the wire, the current will pass through the wire. Open circuit: when the wire in the circuit or the electrical appliances are in poor contact, the circuit can not work. When the bulb lights up, the bulb is open when the circuit works. Use the ammeter to connect the two ends of the bulb in series with the maximum range, If the current is equal to the supply voltage, it proves that the bulb is short-circuit. Similarly, the ammeter is connected in series at both ends of the bulb. When the ammeter does not read, it proves that the bulb is open circuit. Series connection of the voltmeter: because the voltmeter is equivalent to a resistance with a large resistance, the current can not pass through, so the circuit can not work, So the current will pass through the ammeter, making the circuit short circuit and unable to work

Trouble prawn to me a simple physical problem analysis, such as series or parallel circuit, bulb short circuit or open circuit voltmeter and ammeter all kinds of situations

It's too simple to say that there's no place to go! Series connection: the bulb is short circuited, the total resistance in the circuit decreases, the current increases, the bulb is open circuited, the resistance in the circuit is equivalent to infinity, the current is zero. Parallel connection: the bulb is short circuited, the resistance in the branch decreases, the current increases, the circuit in parallel will be short circuited, no current bulb is open circuited, the resistance of the branch

It can be said that if a small bulb is connected in series with a voltmeter in the circuit, and an ammeter is connected in parallel with the small bulb, what will happen? Why is the small bulb

There is no indication on the ammeter because the voltmeter is in series with equal short circuit
The little light doesn't work
The voltmeter should be equal to the supply voltage

Connect the voltmeter, ammeter and small bulb in series in the circuit. After closing the switch, what will you see
Better explain why

The small bulb doesn't work, and the ammeter shows very little, because the resistance of the voltmeter is very high

What is open circuit, short circuit, open circuit? How to know whether the bulb is short circuit or open circuit? What about the series connection of voltmeter? What about the parallel connection of ammeter? It's junior high school science knowledge