The objective of the lab was to investigate the nature of capacitors and electrostatics.
Capacitors are capable of storing electric charges, and can be made with two parallel
conducting plates separated by a layer of insulating material such as plastic film. The
charge stored by the capacitor is related to the capacitance of the capacitor C and the
voltage difference between the two conducting plates across the capacitor,
relationship is governed by the equation Q=C
V, where Q stands for charge. Therefore,
Q, can be calculated if C, a constant, and
V, measurable using a Digital Voltmeter, are
known. Electric charges are transferable between capacitors, so that charges will be
distributed from a charged capacitor to a discharged capacitor. However charges cannot
be destroyed nor created so that the total charge on one capacitor must be equal to the
final charge on both capacitors after contact. In this case what changes is the voltage,
which can be measured using a DVM. The measured or observed final voltage should be
close to the theoretical value C1V/(C1+C2). Similarly, when a charged capacitor is
connected to a resistor, the charges will transfer to the resistor where it is turned into heat.
This process follows an exponential decay model and is governed by the equation
Q(t)=Q0e^(-t/RC), where RC is a constant.
First, voltage follower unit was setup and properly connected to the DVM. Next, a
glass rod was rubbed against a cloth, and the glass rod was placed to touch the input of
the voltage follower, the reading on the DVM was recorded. Next, a rubber rod was
rubbed with the same cloth and placed against the input once again, the reading was again
recorded. Then, the voltage follower, with its inherit .1uF capacitor, was connected to a