Inductance is a measure of the emf generated by energizing a coil. It is a fundamental property of an electrical circuit that opposes any change in the current flowing through it. Here is a detailed explanation of why inductance is the measure of emf generated by energizing the coil:
- What is Inductance?
Inductance is a property of an electrical circuit that describes the ability of a coil to store energy in the form of a magnetic field when current flows through it. It is denoted by the symbol 'L' and is measured in henries (H).
- Emf Generated by Energizing the Coil
When a current flows through a coil, a magnetic field is generated around the coil. According to Faraday's law of electromagnetic induction, any change in the magnetic field induces an electromotive force (emf) in the coil. This emf opposes the change in current flowing through the coil.
- Relationship Between Inductance and Emf
The emf induced in a coil is directly proportional to the rate of change of current flowing through the coil. Mathematically, this relationship is given by the formula: emf = -L(di/dt), where 'L' is the inductance of the coil, 'di/dt' is the rate of change of current, and the negative sign indicates that the emf opposes the change in current.
- Role of Inductance in Circuit Behavior
Inductance plays a crucial role in the behavior of electrical circuits. It causes delays in the establishment of current flow and leads to effects such as inductive reactance in AC circuits. Inductors are used in various applications, including filters, transformers, and energy storage devices.
In conclusion, inductance is the measure of the emf generated by energizing a coil due to the magnetic field stored by the coil. It is a fundamental property of electrical circuits that influences the behavior of current flow and is essential for various applications in electrical engineering.