All resistors and all voltages must be of the same units.

Example: Enter voltages in Volt or all voltages in mV. Enter all resistors in Ohm or all in KOhm. Do not mix units. Enter only numbers without any letters (units).

If there is a load applied on the output (U2) then use for R2 the equivalent resistor which consists of the actual R2 value and the load resistor.

For a first order RC-filter the cut-off frequency (f

R

The time constant ω is equivalent to 2 π f

Enter 2 values and the calculator will calculate the 3rd value. Select the correct units.

R=U/I

U=R*I

I=U/R

Simple general purpose calculator:

The power consumtion (P) of an electic device with the resistance R, current I and voltage U is:

P=U*I

P=U

P=I

If R is a simple resistor (and e.g not a motor) then all power will be dissipated as heat.

You can use the general purpose calclulator under "Ohm's Law" for this formula.

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© Guido Socher, Version: 2010-03-02