An autotransformer is an electrical transformer with only one winding. The winding has at least three electrical connection points called taps. The voltage source is applied to two taps and the load is connected to two taps one of which is usually a common connection that is also connected to the source. Each tap corresponds to a different source or load voltage. In an autotransformer a portion of the same winding effectively acts as part of both the primary and secondary winding. The ratio of secondary to primary voltages is equal to the ratio of the number of turns of the winding they connect to. For example, connecting at the middle and bottom of the autotransformer will halve the voltage. Depending on the application, that portion of the winding used solely in the higher-voltage portion may be wound with wire of a smaller gauge, though the entire winding is directly connected.

Automotive Non-Transponders include domestic automotive, foreign automotive and high security automotive non-transponders.

Automotive Switches features 20A 12V DC, contact resistance of 35m ohms maximum, 500V DC insulation resistance, 1,500V AC dielectric strength, operating temperature of -30 to +80 degrees and bulk packaging.

Automotive Transponders find use in applications where contactless identification is in demand. Transponder exchanges data by an inductive coupling with a receiver base station. It is also used in auto locking applications. This involves placing a microchip in the head of the key, which are a miniature transmitter and receiver. There is an engine management system in the engine compartment that can recognize the signals transmitted from the key. If the correct signals are not detected the engine will not start.