Editing Electrical element (section)

==Examples==
The following are examples of representations of components by way of electrical elements.
* On a first degree of approximation, a [[battery (electricity)|battery]] is represented by a voltage source. A more refined model also includes a resistance in series with the voltage source to represent the battery's internal resistance (which results in the battery heating and the voltage dropping when in use). A current source in parallel may be added to represent its leakage (which discharges the battery over a long period).
* On a first degree of approximation, a [[resistor]] is represented by a resistance. A more refined model also includes a series inductance to represent the effects of its lead inductance (resistors constructed as a spiral have more significant inductance). A capacitance in parallel may be added to represent the capacitive effect of the proximity of the resistor leads to each other. A wire can be represented as a low-value resistor.
* Current sources are often used when representing [[semiconductor]]s. For example, on a first degree of approximation, a bipolar [[transistor]] may be represented by a variable current source controlled by the input current.