# Electrical voltage

Electrical voltage

The electric voltage indicates how strong the drive of the electric current is.

Formula symbol:

Unit: U

one volt (1 V)

Measuring the electrical voltage

The electrical voltage is measured with voltmeters, also called voltmeters. Frequently, multiple measuring devices are also used, which can be switched as voltmeters - https://domyhomework.club/math-problem-solver/ . Voltmeters are always connected in parallel to the device on which the electrical voltage is to be measured.

When measuring the electrical voltage with a multimeter, proceed as follows:

Set the type of voltage (DC or AC) present in the circuit on the meter. Set the meter to the largest voltage measuring range.

Connect the meter to the circuit in parallel with the electrical device! For DC voltage, make sure that the negative pole of the electrical source is connected to the negative pole of the meter and the positive pole of the source is connected to the positive pole of the meter.

Switch the measuring range down so that the reading can be taken in the last third of the scale if possible! This reduces the measuring error.

The electrical voltage can be calculated with the equation:

U=WQ W work to move the charge Q electric charge

The electrical voltage can also be calculated using Ohm's law:

U=I⋅R I electric current R electric resistance.

Electrical voltage in unbranched and branched circuits
In an unbranched circuit, the sum of the partial voltages is equal to the total voltage. The following applies:

U=U1+U2 U total voltage U1, U2 partial voltages

In a branched circuit, the total voltage is exactly as great as the partial voltages. The following applies:

U=U1=U2 U total voltage U1, U2 partial voltages