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An ideal voltmeter has infinite impedance(resistance). If you were to break the circuit and put it in series and try to make a measurement, it is easy to see that the circuit would act completely differently and your measurement would be wrong. An ideal ammeter is always connected in series because it has 0 resistance, so all of the current would flow through it, and not through the wire that you are trying to measure the current of.

A better answer though is to think about what you are trying to measure. When you say something is 3 Volts, that is a difference between the voltages at two different points. If you want to see what the voltage drop across a resistor is, for example, you need to put one probe of the voltmeter on one side of the resistor and the other probe on the other side of the resistor. That setup is simply called being in parallel.
Voltage is potential difference between two points, hence measured across or in parallel, where as current is measured in series since current flows (*)

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9y ago
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9y ago

voltmeter is a device used for measuring voltages across a circuit, in order to measure voltages accurately we 've to connect it in parallel to the circuit because of the fact tht voltge is same in parallel and divides in series so if connected in parallel it will show the exact volt as in circuit but if connected in series the voltages we be the sum of tht drops in circuit and in voltmeter.

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The clue is in the word, 'potential difference'! A voltmeter measures the potential difference between two different points in a circuit and, so, it must be connected between those two different points. It is, therefore, in parallel with the part of the circuit between those two points.

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13y ago

It will allow to read the voltage to reflect the present current flow

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When a voltmeter is connected across a load, it will read the voltage dropped across the circuit load. If there is no load in the circuit, the meter will read the supplied voltage to the circuit.

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11y ago

By definition a VM measures the EMF - voltage - between two points.

Even if the two points represent a series circuit the very act of placing the VM between the two points creates a parallel circuit - the original circuit paralleled by the VM circuitry.

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10y ago

You measure Resistance with an Ohmmeter not a Voltmeter. If the unit is a Multimeter then make sure that it is set to the correct Ohm Range. The only way to measure resistance or voltage is to attach the meter in Parallel to the Load being measured. That is the way it works. In series you would get an erroneous reading.

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12y ago

We connect a voltmeter in parallel to a circuit in order to measure the potential difference between two terminals

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Q: What happens when voltmeter is connected in parallel?
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Related questions

How is resistivity connected to resistance?

Resistance is connected in parallel with voltmeter or say, voltmeter is connected in parallel with resistance.


Voltmeter is connected in parallel with resistor?

A voltmeter can be connected in parallel with a resistor to show the voltage across the resistor.


How should a ammeter and voltmeter be connected in circuit?

Ammeter is coneccted in series with circuit but Voltmeter is connected in parallel.


Describe the proper placement of a voltmeter in a circuit?

A voltmeter should be connected in a parallel connection


Is the voltmeter always connected in series to the circuit?

in parallel


Is a voltmeter placed parallel to a circuit?

Depends. What did you want to measure? If it's voltage drop across the incandescent element, then you had better hook up your infinite resistance voltmeter in parallel with the lamp.


How is a voltmeter connected in the circuit to measure the potential difference between two points?

The voltmeter is connected in parallel between the two points whose potential difference is required.


What happens if an ammeter is connected in parallel and voltmeter connected in series in a circuit?

The voltmeter will register the volts, the ammeter will either explode or blow a fuse since it has a very low resistance and is designed to be used in series to measure the current flowing through it.


How should voltmeter be connected to measure the potential difference across a resistor - in series or in parallel?

In parallel.


Should a Voltmeter always be connected in a series with a component?

Voltmeter should be connected always in parallel to a circuit ANSWER : IT should be in parallel except when used to measure current. Then it should be placed in series across a shunt.


What is the function of the voltmeter in an electric circuit?

A voltmeter is a device to measure the voltage in a electric circuit, and must have be connected in parallel to it.


How are voltmeter connected to circuit?

Usually a voltmeter is connected across the load whether or not it is AC (Alternating current) or DC (Direct Current). A voltmeter is never connected in series with the load as this may cause serious injury or damage. The meter will absorb the full potential .