Practical Electronics/Sources

From Wikibooks, open books for an open world
Jump to navigation Jump to search

Sources that provide Voltage or Current to provide electricity for electrical devices to operate.

Voltage Sources[edit]

There are two Voltage Sources generally used in any applications namely AC and DC Voltage Source:

DC Electricity[edit]

DC stands for Direct Current . Voltage source that has constant voltage that does not change with time and can be expressed mathematically

v = V

DC Voltage sources are found in Batteries,

AC Electricity[edit]

AC stands for Alternating Current . Voltage source that has current amplitude varies sinusoidally with time and can be expressed mathematically

v = Vp Sin wt
Vp The highest value of the voltage also called Peak Voltage measured in Volt (v)
t - time measured in second (s)
w - Angular Frequency . w = 2πf =

AC Voltage source are generated from AC generators.

Current Sources[edit]

Current sources act in a similar manner to voltage sources, except that they try and maintain a constant current. Current sources are mainly constant current devices, meaning that they have a set value that they try and maintain, but also exist as variable devices, such as in transistor models.