-www.iamtechnical.com-

Unloaded Voltage Divider

For the purposes of measurement, it is often necessary to tap sub-voltages from a primary voltage. This is done by means of voltage division. Illustrated below is a voltage divider consisting of two series-connected resistors R1and R2.

Voltage Dividers !

The supply voltage U to the outer terminals and this is then divided into the two sub-voltages U1 and U2. According to the voltage division law,

Voltage Dividers !

According to Ohm's law, the current in the voltage divider is

Voltage Dividers !

and the voltage drop across the two resistors is

Voltage Dividers !

If the expression for current as derived above is substituted into these two equations, the following equations are obtained for the two sub-voltages:

Voltage Dividers !

These equations apply only when no current is being tapped from the voltage divider, i.e. in the no-load state.

The interactive animation below shows a voltage divider whose supply voltage and resistance values can be adjusted with the mouse. If you modify these variables, you will be able to observe the corresponding effects on both sub-voltages.

More From Iamtechnical.com

Facebook Like For Iamtechnical.com !