Voltage divider

That Voltage divider is a device from usually homogeneous construction units, which a detailed tension lowers around a certain level.

For DC voltages become as construction units electrical assigned, Alternating voltages a realization is by means of resistances, Condensers, and possible.

The structure of standard consists of a series connection of two resistances R₁ and R₂.

The input voltage U_e to the total circuit, the output voltage is applied U_A only at one of the resistances, in the picture R₂, measured. Then those applies to the unloaded voltage divider (for this special example) Voltage divider formula:

<math>

U_a = U_e \cdot \frac{R_2}{R_1+R_2} </math>

Somewhat more generally calm the voltage divider rule the following means: In a series connection the voltage drops are proportional to the resistances, at which they drop.

As simple example, if R₁ = R₂ is, then applies:

<math>

U_a = \frac{U_e}{2} </math>

Every other relationship between 0 and 1 is also possible.

With an adjustable resistance (Potentiometer) can the pick-up for U_A on a continuous resistance body to be shifted, D. h. the division ratio is then variable.

See also

• Flow divider

Web on the left of

• Computer for loaded and unloaded voltage dividers