Using a resistor (R) and an capacitor (C) in series with an AC voltage source, we can create a simple low-pass filter. We by changing the R and C values, you can adjust what frequencies get passed at, say, greater than half the original voltage.
    There is an illustration of the circuit below.

Set the initial parameters of the circuit :
R =  ohms
C =    microFarads
frequency scale factor =  cycles/sec
      

    Here are the equations we will use ...