If we bring these
two parts together, as they really are in the point-contact
transistor circuit, both lamps will shine. This is because
the left, forward biased, part of the circuit introduces
enough holes to be able to activate the right part as well.
So with the transistor you are able to control and
influence one part of the circuit, the right part, with the
aid of the other, the left part.
electrodes of the transistor have different names.
Connected to the metal base is the contact simply called
the base-electrode. The gold contact where the current
enters (left) is called the emitter-electrode and the other
gold contact (right) is called the