# why current is preferred to measure in series and voltage in parallel?

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• Anonymous

Because, the current measuring device, like an ammeter, would have a very low resistance, and if you connect it in parallel, it would short circuit the phase and neutral.

Similarly, the voltmeter would have a very high resistance, and if you connect it in series, all the voltage would drop in the voltmeter itself and no voltage would be available to the load.

• cepero
Lv 4
3 years ago

Voltage In Parallel

The reason is because current is a measurement of flow - how many electrons are passing through the wire, whereas voltage is a measure of the difference is energies between two points.

In order to measure the amount of electrons passing through a wire, you actually have to place the multimeter within the flow. To measure flow, the multimeter places a VERY LOW resistance into the circuit and measures the voltage drop across that resistance. By using a very low resistance, the multimeter has a negligible impact on the circuit when placed in series.

In order to measure the energies between two points, the multimeter is place in parallel in the circuit with a HUGE resistance and measures the current through the resistance. By using a huge resistance, the multimeter has a negligible impact on the circuit when placed in parallel.

Note: when placing a multimeter into a circuit in series with it turned to the voltage setting or in parallel with the current setting, you will either destroy the multimeter or trigger the circuit breaker or fuse.

In simple words;

Current is a measurement of amount of charge carriers (electrons) flows through a conductor at that instance. So to measure the current the current should flows through the meter, hence the meter will get the value of current.

Voltage is otherwise known as potential difference. That is potential difference between the two points. So to measure the voltage difference between two points (one is line and other is neutral that is zero potential) we have to connect the meter to connect the two points whose potential difference have to be known.

To know the difference between voltage and current :

Voltage is also called EMF that is Electro Motive Force. That is this is the cause to pull the (free) electrons in the conductor to move.

Current is the amount of electrons moves (flows) through, in a instance of time.

Note: Without voltage no current is possible, but without current there will be a voltage.

For better understanding:

Comparing the electrical system to the liquid pipeline system.

Where a pressure in the pipe is Voltage and the amount of fluid flows out from the pipe in a instance of time is current.

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