Why is it that when measuring the current, the current does not pass through the electrical applianc

Here's a trick. If a voltmeter is connected in parallel into the circuit (the resistance of the voltmeter is regarded as infinity in junior high school), then the current will "very thoughtfully" not go through the circuit where the voltmeter exists (because the obstruction is too large), and directly pass through the electrical appliance, then the voltmeter is working normally, and this is a normal voltage measurement circuit.

If an ammeter is connected in parallel to the circuit (the resistance of the voltmeter is regarded as infinitesimal in junior high school), the vast majority of the current is still "very thoughtful" to go to the circuit with small resistance (that is, the circuit where the ammeter exists), but the ammeter cannot withstand excessive current (by i = u r, r is very small, and the current is very large!). It is easy to burn out, it is a wrong circuit, and it will burn out the ammeter.

The ammeter is equivalent to a wire, and the current selects a shortcut back to the negative pole.

The resistance of the ammeter is very small, generally negligible, so the entire circuit is short-circuited, and the current passes directly through the ammeter.

Wrong. When measuring the current, the circuit passing through the electrical appliance is disconnected, and the series ammeter can measure the current of the electrical appliance.

The resistors are connected in series in the ammeter and do not burn out.

The ammeter must be connected in series to the circuit, if you connect the ammeter in parallel with the consumer, the current will definitely not pass through the electrical appliance but will flow back to the negative electrode by the ammeter, that is, a short circuit.

The current directly passes through the ammeter and returns to the negative pole, which will burn out the ammeter, ...... classmate

The voltmeter will never be damaged when used as an ammeter.

The ammeter can only be damaged when the voltmeter is used.

The reason is that the voltmeter resistance is originally very large, so large that it can be directly connected in parallel in the circuit (in the power supply), so if it is used as an ammeter, he can only read inaccurately (but this number is close to the voltage of the power supply) and the electrical appliance cannot work, because he is simply similar to a large resistance, and the current flowing through is very, very small, so the electrical appliances in series with the voltmeter cannot work normally.

However, when the voltmeter is used as an ammeter, it will never be damaged. Of course, when this voltmeter is used, this range must be greater than the power supply voltage. Otherwise, it may be damaged.

Summary. No, the negative terminal of the ammeter is connected to the power pole in the circuit, and the current to be measured is the current flowing from one end of the circuit to the other. Typically, the positive terminal of the ammeter is connected to one end of the current to be measured, while the negative terminal is connected to the other end.

No, the negative terminal of the ammeter is connected to the power supply pole in the circuit, while the current to be measured by Minqiao Kiyoshi is the current flowing from one end of the circuit to the other. Typically, the positive terminal of the ammeter is connected to one end of the current to be measured, while the negative terminal is connected to the other end. In front of the bridge.

How to see whose current is measured by the ammeter, is there a mantra that is easy to remember.

The formula for measuring the current of the ammeter: 1. Look at the pointer first, the current size, pointing to the right side of the loss, that is, positive DC. 2. Otherwise, if you point to the left, negative current will appear.

3. The pointer can indicate the size of the current and the number of rotations of the finger needle, which is the strong degree of the current. 4. The current notation method can be matched with the circuit, and the size of the current is the strength of the current. 5. Observe the rotation of the pointer to know the flow direction of the current.

Whose negative pole is connected to the positive pole of the ammeter is to measure whose current is right?

Yes, whose negative pole is connected to the positive pole of the ammeter is to measure whose current. When the ammeter is connected to the circuit, the positive pole should be connected to the positive pole on the line, and the negative pole should be connected to the negative pole carried to the line by the fan, so that the current of the line can be measured. When connecting to the circuit, it is necessary to pay attention to whether the positive and negative poles of the ammeter are connected correctly, if they are incorrect, it may lead to inaccurate measurements or even damage to the ammeter.

Hello, dear, very happy to answer for you! Here's the answer, check it out! Yes, the negative pole of the ammeter is connected to the current of the mold to be measured.

Answer analysis: An ammeter is an instrument used to measure the size of the current in the circuit. The ammeter has two pins, one positive and one negative.

When using an ammeter, it is necessary to connect the positive pole of the ammeter to the positive pole in the circuit, and the negative pole of the ammeter to the negative pole of the circuit, so that the current in the circuit can be accurately measured. If the connection is not made correctly, the ammeter may be damaged or the amount of current in the circuit may not be measured correctly. Extension:

In addition to connecting the correct positive and negative poles, there are some precautions to be aware of. For example, when using an ammeter, the appropriate range should be selected and the power supply in the circuit should be disconnected before the current can be measured. It is also necessary to pay attention to the accuracy and sensitivity of the ammeter to ensure the accuracy of the measurement results.

In practical applications, ammeters are often used in conjunction with other instruments, such as voltmeters, resistance meters, etc., in order to have a comprehensive understanding of the various parameters in the circuit. Your questions have been answered! I hope to be able to help you, if there is something wrong, you can continue to consult, bear with me!

An ammeter is a measuring tool made based on the action of an energized conductor in a magnetic field by the force of a magnetic field.

The ammeter can generally directly measure the current of the order of microampere or milliampere, and in order to measure larger currents, the ammeter generally uses a shunt resistor (also known as a shunt). Even so, it is generally only possible to measure a few amps.

Because the internal resistance of the ammeter is very small, if it does not pass through the electrical appliance, it is directly connected to the positive and negative poles of the power supply, which is almost equivalent to the type of short circuit of the power supply, even if the voltage of the power supply is not very high, but because the resistance in the circuit is very small, the current value will be large to the extent of tens of amperes or even hundreds of amperes, so that the ammeter will be burned out almost instantaneously.

Place the ammeter in front of the electrical appliance and form a series connection with the electrical appliance, and the current is limited by the resistance of the electrical appliance, so it is not so large.

If it is directly connected to the positive and negative poles of the power supply, the current I = U (R+R) through the power supply and the ammeter, the internal resistance of the ammeter and the power supply is very small, so the current is super large, and the heat generated P=i 2R = UI is also super large, the power supply is easy to burn out, and the ammeter will be biased at the light and burned out at the heavy.

The current of the added electrical appliance is the current that passes through the normal range of the electrical appliance, and will not burn out the power supply and ammeter.

Because the ammeter is approximately without resistance, if it is directly connected to the positive and negative poles, current = voltage resistance, the resistance is infinitely small, then the current will be infinitely larger than the range, and the ammeter can not bear it, because the electrical appliance has resistance, as long as the resistance of the voltage electrical appliance is less than the maximum value that the ammeter can display, it can be placed.

If it is not connected to the electrical appliance, because the resistance value of the ammeter is close to 0, the current in the circuit is too large and it is easy to burn out.

The ammeter is an instrument for measuring the current, and it must be connected in series in the circuit when used, so that the current flows from the positive terminal post into the ammeter, and flows out from the negative binding post

So the answer is: strings; with electrical appliances

Answer: Because the resistance value of the ammeter is very small, in fact, it is equivalent to a wire, if the ammeter is directly connected to the two poles of the power supply, it will cause a short circuit in the power supply, which will burn out the power supply and the ammeter

Defeat with a voltmeter.

When measuring voltage, the voltmeter should be connected in parallel at both ends of the circuit under test, so that the current flows from the positive terminal post of the voltmeter and flows out of the negative binding post. Correct; Negative; Range

The internal resistance of the ammeter is very small, which is equivalent to a wire, and if the ammeter is directly connected to the poles of the power supply, it is determined by the formula i=u

r can know that the current will be very large, and the ammeter will burn out

Therefore, choose D