Inductors are passive electrical components capable of storing electrical energy in the form of magnetic energy. They use a conductor wound into a coil through which electricity flows and generates a magnetic field. The capacity of an inductor depends on the number of coils, materials wrapped around the coil, the cross-sectional area of the coil and its length. Along with capacitors and resistors, inductors are three of the main passive linear circuit elements which make up electrical circuits. There are various types of inductors. The ferromagnetic core inductor uses iron to increase the inductance of the coil while laminated core inductors are similar to transformers in function. The most common type is the variable inductor including the variometer. Larger inductors provide power supplies for electrical equipment and rectify utility AC to provide pure, battery-like DC. The choke inductor blocks AC while allowing DC to pass. Other kinds include: air core, radio frequency, ferrite core and toroidal core inductors. Inductors are used widely in wireless communications for tuning circuits for radio and television transmissions as well as for computers and peripherals. In parking sensors, the coil is placed in the road and attached to an inductance meter and the parked car acts like the core.

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