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An electric network is excited when there is an answer, that means, there are currents on the electric branches and voltage on its branch points. GENERATORS A generator is a device whose function is excite the electrical circuits. These devices can be classified in: Voltage generators and Current generators And they can be classified in real ideal The real voltage generator For purposes of study it device is equal to an ideal voltage generator serial with a resistance. In this type of device, the potencial difference in its terminals depends on the current that flows through it. For many purposes in practice this generators can be built but it can be considered as an ideal generator. For example: A battery A common collector transistor The real current generator For purposes of study it device is equal to an ideal current generator in parallel with a resistance. Example Common base transistor This generator sets a current through its terminals that depends on the potencial difference existing between them.