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# What is the difference between a volt meter and a am-meter?

Updated: 9/19/2023

Wiki User

11y ago

A voltmeter measures the difference in potential between two points on a circuit. An ammeter measures the amount of current passing through a point in a circuit. Although you often see them packaged together in a tool called a multimeter, they measure different quantities: Voltage, also known as potential difference, measured in volts, and Current, measured in amperes, or just amps.

Also, they're used in somewhat different ways:

-- The voltmeter simply touches the two points in the circuit between which the voltage is measured.

-- The ammeter has the circuit current flowing through it. That means the circuit must be

broken briefly, and the ammeter connected into the 'hole', before the current can be measured.

(There are instruments that are exceptions, but they're rather specialized. The statement

above holds generally true for the common ammeter.)

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11y ago

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Q: What is the difference between a volt meter and a am-meter?
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Related questions

### How many voltmeter and ammeter are in dc watt meter?

There is no volt meter or amp meter in a DC watt meter.

### What is the proper placement of an ammeter in a circuit?

Ammeter should be inserted in the place where we need to find the current. Care must be taken while inserting ammeter such that it is in series always. For example if we need to measure the current through any device, we have to connect the ammeter in series with tht device.

### How do you check for amp draw with volt meter on automobile?

you dont you need an ammeter for that

### How do you measure voltage?

Voltage can be measured using the difference between the potentiel between two ends of wire or by using a volt-meter. You can easily measure volt by volt or multimeter but remember voltage always measure across the components but in parallel

### Compare how an ammeter and voltmeter are connected in a circuithow are they different?

ammeter connected sereal. internal resestance very low volt meter connected parrel. high internal resestance.

### What will happen if the voltmeter was inserted in place of an ammeter?

You would load the circuit, and it is likely it would not operate correctly. A volt meter is designed to have a very high resistance between the two probes; an ammeter is designed to have a very low resistance. For instance, say you have a 120 watt light bulb that runs on 120 volts (you would then draw ~1 amp of current). If you tried to measure this with a meter that has .1 ohm resistance on ammeter setting, and 1,000,000 ohms on volt meter: Error due to loading: ammeter: .1 / (120 + .1) = .08%; Current will be .999Amps, power to the light bulb will be 119.9 watts Volt meter: 1,000,000/ (120 + 1,000,000) = 99.9%; current will be 120micro Amps, power to the light bulb will be 14.4 milliwatts (the light bulb will not appear to be on).

### What is the difference between milli volt meter and volt meter?

A milli voltmeter is suitable for measuring voltage/potential difference in milli volts, thus they measure smaller voltages. A regular voltmeter is used to measure comparatively larger voltages.

### Why volt meter are attached parallel to the circuit?

Because nothing has to pass through the meter. The voltmeter is only measuring the DIFFERENCE in electric potential between two points.

### What meter can cause a hazardous condition with volts not staying with in the range's in a in-line ammeter or volt meter?

This can occur with a permanently installed, or clamp on, ammeter, when the secondary winding is not maintained in a shorted condition. This changes the mode of the current transformer from current reduction to voltage increase, often of a substantial, lethal value.

### Can you measure power with a volt meter?

No. A voltmeter measures potential difference (voltage). To measure power, a wattmeter is required. On the other hand, for a d.c. circuit only, you could use a voltmeter and an ammeter, and multiply their readings in order to calculate the power of a load.

### What is the instrument called that measures current?

The instrument used to measure electrical current is called an ammeter, which is actually a shortened form of 'amp meter'. The current is measured in amperes. In scientific labs, a much more sensitive instrument called a galvanometer is used to measure very small currents.

### Why volt meter is always placed in parallel?

Because the quantity it measures is 'EMF' or 'potential difference', that is,the difference in potential between two points. There may be 1 or 1,000circuit components between the two points.