Physics in the second year of junior high school what the hell is a short circuit? Will a short ci

A short circuit is a phenomenon in which the power supply is directly connected to a closed loop by the wire without passing through the load, and the phenomenon shown in the drawings is a short circuit.

The condition for a short circuit to burn out the circuit is that the power supply is short-circuited, that is, the two ends of the power supply are directly connected without passing through the electrical appliance.

This is when a tremendous current is generated in the circuit that burns out the power supply.

If only a local short circuit occurs, and no current is passing through the short-circuited part, the circuit will not be burned.

A short circuit means that the current does not pass through the electrical appliance and returns directly to the negative pole. The short-circuited part will not burn out, but the circuit may be burned out due to a short circuit in one of the appliances.

What does the short-circuited part without current mean, and is it the short-circuited part, of course, it will not be burned out, and how can the current not be burned?

A short circuit is when current flows directly from one part of the load to the other without passing through the load. A short circuit does not necessarily burn out the circuit, it depends on whether there are other loads in the circuit that have not been short-circuited.

Power short circuit: The current is returned to the negative electrode directly without passing through the electrical appliance.

Local short circuit: A wire is directly connected to both ends of the electrical appliance, and there is no current flow in the part of the short circuit.

It's that there is no electrical appliance in the circuit, which is a lot of current and easy to burn out the power supply.

A short circuit is equivalent to connecting the two ends of the power supply directly with a wire without passing through the consumer.

A short circuit means that the current does not pass directly through the electrical appliance and returns to the negative electrode.

Short circuit: connect the wire directly to the positive and negative poles of the power supply, and the current shortcut flows directly from the positive pole of the power supply to the negative pole without passing through the electrical appliances.

The definition of a short circuit is that there is no load on the circuit.

Generally speaking, the two ends of the wire are directly connected together, and there is no light bulb, motor and so on in the middle.

There's no drawing software to give you drawings.

Formula : i=u r In the circuit, if only the wire and the power supply form a circuit (because the r of the wire can be omitted), the u of the power supply is fixed, according to the company, the current through the wire is infinite, this is called a short circuit.

There is also a formula for heat generation, q=(square of i)*rt where the current is infinite, and the heat is infinite. This will burn out the circuit.

Short circuits include short circuits in the power supply and short circuits in electrical appliances.

Because the current flows directly through the wires and goes directly back to the negative pole of the battery.

What the pure wire is connected in parallel with is what is short-circuited.

To put it simply, the current likes to take shortcuts (lazy), if there is a wire connected to the two poles of the power supply in the circuit, there is no electrical appliance (i.e., resistance) in the middle, and there is an electrical appliance on the other wire, then the current will only go from the wire that does not use the electrical appliance, and will not flow through the electrical appliance on the other wire, which will form a short circuit (which will cause the power supply to burn out).

Hope it helps--

Are you sure you drew it right? Only s1 and s2 are closedS3 is not closed? The only one that causes the short circuit is L2 (the one on the right), because there is a wire connected to its poles, then the current chooses the wire that does not use the electrical appliance, so L2 is short-circuited.

This explanation is difficult for many students to understand at first!

There is resistance at one end, there is no resistance at the other end, and the current will go to the end without resistance" is wrong!

In fact, it is impossible to do without resistance, but it is very small. There is resistance and "no resistance", the current has to go for both, and the resistance of "no resistance" is very small, and from Ohm's law, the current is very large, and the current with resistance is very small, so that it cannot work normally.

So usually, we say that it causes a very large current, causing ** or the circuit does not work properly, so we say that it is a short circuit.

When connected in parallel, as long as one of the circuits is a wire, the current will go through it, flowing directly from the positive pole to the negative pole, resulting in a power supply circuit; When connected in series, there will be no short circuit if there is resistance, and there will be a short circuit if there is no resistance; The voltmeter is equivalent to an open circuit, and it is not considered when looking at the circuit diagram; The ammeter is equivalent to a short circuit, which can also be said to be the role of a wire, and cannot be connected in parallel with all the resistors in series, otherwise the power supply circuit. The above is my summary, I hope it will help you!

You should be more detailed

For example, in the circuit you mentioned, the resistance of the wire is very small and we can ignore it, and the resistance at the other end has a great effect on the current resistance, so the current basically does not go to the resistive end. I remember using the water flow as a metaphor, imagine

It can also be understood in this way, the atomic structure of the resistor is relatively stable, the charge outside it is not easy to ionize, and the electrons outside the atom of the wire are easy to ionize, one side gives force and the other side does not give force, and the current of course flows to the side that gives the force.

A short circuit means that the two wires are directly connected together without passing through the electrical appliance or resistor.