April 14

Capacitor Voltage - Current Relations

In this lab, we measure the relationship between the voltage across and the current passing a capacitor.

This is what we predicted for Ic and Vc.

The current through a capacitor is i=Cdv/dt.

The voltage across a capacitor is v = 1/c * int(idt)

When passing sine wave through the capacitor, the current lacks behind the input voltage for around 90 degree. It's not 90 degree because the frequency of the input can have effect on the angle of both Vc and Ic.

When passing triangle wave through the capacitor, the current also lacks behind the input voltage for around 90 degree. It's not a square wave as we predicted because there is latency inside the capacitor. Also, it's not 90 degree because the frequency have effect on the angle.