Proper Use of Physical Ammeter Physical Ammeter Symbols

1.The connection of the ammeter is divided into positive and negative binding posts, and the current should be from"+"The binding post enters, from"-"The binding post is out (otherwise the pointer is reversed.) )

2.In principle, it is connected in series in the circuit, and you can connect it in parallel, depending on the needs and the actual situation, but generally when the ammeter is used to measure the current, it is connected in series.

3.The measured current should not exceed the range of the ammeter (the method of touch test can be adopted)4It is absolutely forbidden to connect the ammeter to the poles of the power supply without passing through the electrical appliance, and check whether the range is exceeded. );

1. Tandem. 2. There should be resistor protection, and the resistor should be adjusted to the maximum blocking place.

3. The power supply voltage should not be too large.

4. There can be no short circuit in the circuit, otherwise the current will be too large

I think that's it

Personal opinion, but roughly correct.

How to use the ammeter correctly.

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When using an ammeter in a physics problem, you must let the current pass through two electrical appliances to measure the total current?

If it is close to the power supply, the total current is measured without any electrical appliances in the middle, and the trunk and branch roads are seen.

The ammeter should be connected in series in the circuit.

An ammeter is a meter used to measure the current in an AC and DC circuit. In the circuit diagram, the symbol of the ammeter is "circle A". The current value is measured in "amps" or "a".

An ammeter is made based on the action of an energized conductor in a magnetic field by the force of a magnetic field. There is a permanent magnet inside the ammeter, which generates a magnetic field between the poles, there is a coil in the magnetic field, there is a hairspring spring at each end of the coil, the spring is connected to a binding post of the ammeter, between the spring and the coil is connected by a rotating shaft, and there is a pointer at the front end of the rotating shaft relative to the ammeter.

When there is a current passing through, the current passes through the magnetic field along the spring and the rotating shaft, and the current cuts the magnetic inductance line, so it is affected by the magnetic field force, which makes the coil deflect, and drives the rotating shaft and pointer to deflect.

Since the magnitude of the magnetic field force increases with the increase of the current, the magnitude of the current can be observed by the degree of deflection of the pointer, which is called the magnetoelectric ammeter, which is the kind we usually use in the laboratory. In junior high school, the ammeter used is generally 0 and 0 3 a.

William Edward Weber's contributions to electromagnetism are manifold. In order to conduct research, he invented many electromagnetic instruments. In 1841, a two-wire ammeter was invented to measure both geomagnetic and current strength in absolute electromagnetic units.

In 1846, an electric power meter was invented, which could be used to determine both the electrodynamic unit of current intensity and the measurement of alternating current power; In 1853, the geomagnetic inductor was invented to measure the vertical component of geomagnetic intensity.

Weber was very effective in establishing absolute measurements of electrical units. He proposed absolute units and measurement methods for current intensity, electric power, and electromotive force; According to the electrodynamic formula of ampère, the electrodynamic unit of current intensity is proposed; The absolute unit of resistance is also proposed.

Weber worked with Kohlausch to determine the ratio of the electromagnetic unit of electricity to the electrostatic unit, and found that this ratio was equal to 3 10 8 m s, which is close to the speed of light.

The ammeter has a reading, but the voltmeter has no reading, indicating a short circuit.

There is no reading in the ammeter and no reading in the voltmeter, indicating that it is an open circuit.

There is no reading in the ammeter, but there is a reading in the voltmeter, which means that it is an open circuit, and the voltmeter is connected to the power supply at two levels.

The specific depends on the circuit diagram analysis.

It depends on the specific situation, and in most cases it will not damage the electrical appliances; If the motor is not rotated when the motor is energized at low voltage, heat will be generated, and the insulation layer will be damaged for a long time.

I can see the building clearly.

c is the filament break.

d Obvious error.

Slippery changes on dry roads.

The open circuit is not working.

Is there still a number for the voltmeter?

2.No. You think about what that's for.

Want to show that you are very good?

If it's high, it's bad. It's okay if it's low.

No, there is no current yet.

According to the indication of both meters, it means that both meters are connected normally.

When the light goes out, the ammeter is almost zero, indicating that there is something with a large resistance in the circuit, so it cannot be A, the bulb is short-circuited, the resistance becomes smaller, and the same is true for BC, the resistance becomes very large, and the ammeter should be 0

So it is only possible that the sliding rheostat is burned out.

2.Yes, if the TV is operated in a power supply with a lower voltage than normal for a long time.

will reduce the service life.

There are many examples of this, and the heat basically belongs to electric irons and rice cookers!

The ammeter should be connected in series in the circuit (otherwise it will be short-circuited. );

The current to be from"+"The binding post enters, from"-"The binding post is out (otherwise the pointer is reversed.) );

The measured current should not exceed the range of the ammeter (you can use the method of touch test to see if it exceeds the range of Sunna.) );

It is absolutely forbidden to connect the ammeter to the two poles of the electric combustion source without passing through the electrical appliance (the internal resistance of the ammeter is very small, equivalent to a wire.) If the ammeter is connected to the two poles of the power supply, the pointer will be crooked, and the ammeter, power supply, and wire will be burned at worst. ).

Ammeter reading: 1See the range.

2.Look at the graduation value (in general, the scale 0 3a is the graduation value, and 0 is 3.)See where the watch hand stays (look from the front before Piquet) - Preparation before use: 1Adjust the zero button with a flat mouth cone change.

2.Select the measuring range.

Two or more wires are separated from a bus, two or more electrical appliances are connected, and finally a bus is integrated into a circuit, which is called parallel connection. That is, several appliances are side by side.

From a wire, through an electrical appliance, and then through an electrical appliance, you can also go through many electrical appliances one by one, and finally come out is also one, which is called series. That is, several electrical appliances are strung together.

The current measured by the ammeter is strung together with the measured electrical appliance. Through the line of this ammeter, which electrical appliances are measured.

The voltmeter is the voltage difference between the two ends of the measuring electrometer, so the two pins of the voltmeter are connected to both ends of the electrical appliance, that is, it is connected in parallel with the electrical appliance.

All appliances connected in series have the same current passing through, but the voltage of each appliance is not the same.

All appliances connected in parallel have the same voltage, but the current flowing through each appliance is not the same.

Voltmeters and ammeters are common tools in circuit measurement, and their use is in line with the requirements of use.

a, voltmeter and ammeter can only be used separately.

b, voltmeter and ammeter"+"The binding post should be connected with the power supply"+"The pole is connected to C, and the voltmeter and ammeter are safer when the maximum range is selected.

d. The voltmeter should be connected in parallel with the circuit under test and the ammeter must be connected in series.

The ammeter must be connected in series with the measured object, and is not allowed to be directly connected to the two poles of the power supply; The voltmeter must be connected in parallel with the object to be measured and can be directly connected to both poles of the power supply.

The ammeter is used to test the current in the circuit, the size of the faucet water flow is the most appropriate, you put the water a little bigger, then the water flow is a little bigger, the current is the same reason, but the current is not visible to the naked eye, you can only use the ammeter in series in the circuit to observe the current when the circuit is working.

A voltmeter is used to measure the voltage of an electrical appliance or power supply