# Source of Electrical Energy

There are two types of

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## Ideal Voltage Source

An ideal voltage source is a two terminal element which maintains a terminal voltage regardless of the value of the current through its terminals. An ideal voltage source can maintain the fixed voltage independent of the load resistance. The internal resistance of an ideal voltage source is equal to zero. Although ideal sources do not exist in reality so in a practical voltage source the voltage across the terminals of the source keeps falling as the current through it increases.This behavior can be explained by putting a resistance in series with an ideal voltage source as shown in figure below. Then the terminal voltage V as Examples of voltage sources – Batteries and Electrical Generators are normally used as voltage sources.