EIM Lab-OnThe-Go Manual page 19

Prepare Components and Tools CH 3
The fabrication process of capacitors may vary to serve for different
engineering purposes.
For general circuiting purposes, ceramic and electrolytic type capacitors
are more often used. Electrolytic capacitors are polarized so we will always
connect the negative polarity to lower voltage.
Being a very important component, the key characteristics of a capacitor
is that it can block DC current while still allowing AC current to pass.
This property makes capacitors a very favored component in functions
such as filtering, smoothing and timing. We have included some exercise
circuits in this guide but you are encouraged to investigate more in-depth
knowledge in our book named Laboratory Manual to Accompany Basic
Electric Circuits.
17