# Wireless Electricity Project. Start Up Project 3

You can light an LED without a battery! It is funny to see that, the LED is glowing without power from a battery. The trick is Wireless electricity that is lighting the LED through the mechanism of Induction. Many projects are available in You tube and selected one simple project for you. The step wise procedure is explained here. You can learn some theory along with this. Make it and enjoy.
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# Familiarize Electronic Components Part XIX – Inductors

Inductance is the effect caused by the magnetic field when electric current passes through a conductor. During inductance , time varying magnetic fields develop in the conductor due to changes in current flow. The unit of Inductance is Henry and the symbol used is L to honour the Physicist Heinrich Lenz. The components inducing inductance are called as Inductors which are mainly coils that are capable of concentrating magnetic field.

# Current Flow Indicator

With this simple circuit, you can confirm the flow of current through AC wires without touching the hot wire. It is an ideal circuit to monitor Laptop charger, Battery charger etc. It is also useful to check the flow of current in concealed cables. The circuit gives an LED indication from a distance of 15 cms if current is flowing through a live wire.

# Trick to detect Electronic Smog

Electrons are invisible to human eye then how can we see the electronic smog existing in our home. Is there any method to see them? Impossible, the only method is to capture the energy from it to activate a circuit for giving a visual indication. When you sit in front of a computer or television, you are being bombarded by harmful waves quietly emanating from it. Even if you turn off the device, your biomagnetic field is still bombarded 24 hours a day, 7 days a week by the EM radiations from power cables, electric and electronic instruments etc. These radiations of different frequencies exist in our environment as Electronic Smog. Extremely low frequencies waves (ELF) exist wherever electricity flows and radiate it from every electrical item in your environment. Let us try this circuit to give a visual indication of the electronic smog.

# Electro Magnetic Compatibility – EMC

EMC is the ability of Electronic or Electrical equipment to operate in their intended electromagnetic environment. Most of the electronic equipments are designed to operate within a defined margin of safety and performance without causing breakdown due to the interference of electromagnetic field.

# Fixed Inductor

Inductance (L) is the property of an electrical circuit whereby changes in current flowing in the circuit produces changes in the magnetic field such that a counter EMF is set up in that circuit or in neighboring ones. If the counter EMF is set up in the original circuit, it is called self-inductance and if it is set up in a nearby circuit then it is called mutual inductance.Fixed inductor uses multiple coils of a conducting material to store energy using a magnetic field. It belongs to the electromagnet family. The voltage produced is proportional to the rate of change in current flowing through it. The higher the number of coils and input current, the higher is the inductance