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demo09 - Demonstrations for Class 9 Inductance You know...

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Demonstrations for Class 9 --- Inductance You know that one coil can induce an Emf in a neighboring coil. It also happens that one coil can induce an Emf in itself, called "self-inductance". These single coils or "inductors" are commonly used in circuit applications. Like resistors and capacitors, inductors for circuit use come in many shapes and sizes. Typically, all they are is a coil of wire wound into a solenoid or a toroid. What inductors do is slow down voltage changes in a circuit—they act as the electrical analog to "inertia". Just like a heavy mass resists motion, an inductor resists voltage change. If an applied voltage goes from zero to a maximum instantaneously, the inductor will ensure that the circuit voltage rises slowly to the maximum voltage. A very common application of inductors and how one coil can induce an Emf in a neighboring coil is the transformer. Transformers are everywhere, for instance in the power supply for your Laptop. By inductance, transformers can take a high voltage and "step it down" to a low voltage, or take a low voltage and "step it up" to a high voltage.
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