Inductance
What is Inductance?
Inductance is the ratio of the electromotive force (EMF) induced in a circuit by the change of current in the circuit to the rate of change of current. Inductance varies depending on the geometric shape, size and material of the circuit. The unit of inductance is defined as Henry (H). Inductance acts like a resistance in the circuit and opposes the change of current. Therefore, inductance is called self-inductance.
The relationship between inductance and the previous topic of electromagnetic induction is that electromagnetic induction causes inductance. As the current in a circuit changes, the magnetic field in the circuit also changes. This induces an EMF in the circuit. This EMF is in the opposite direction of the current and tries to prevent the change of current. The magnitude of this EMF is directly proportional to the inductance of the circuit.
The relationship between inductance and subsequent topics is that inductance plays an important role in alternating current (AC) circuits. In AC circuits, the intensity and direction of current change continuously. This increases the effect of inductance in the circuit. Inductance introduces concepts such as reactive power, phase angle, impedance and resonance in AC circuits. Inductance also provides functions such as filtering, oscillation, damping and energy storage in AC circuits.
Inductance has a great contribution to technological developments. Thanks to inductance, it has been possible to store and control electric energy. Storing electric energy enables electric devices to work in situations such as power outages, fluctuations and failures. Controlling electric energy improves the performance and efficiency of electric devices. Inductance also offers new design and application opportunities in fields such as electronics, communication, automation and robotics.
The practical life applications of inductance are very diverse. Many devices that we use in daily life have or benefit from inductance. For example, transformer, relay, solenoid, motor, generator, inductive sensor, wireless charging device, speaker, microphone, earphone, antenna, radio, television, computer, cell phone, tablet, smart watch and many more devices are related to inductance.
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