what is charging by induction?

Answer 1

By sending out a varying magnetic field, energy can be transferred to another coil to produce an induced voltage. The voltage may be rectified and used to charge a rechargable battery. One such application is the Electric Tooth Brush. The advantage of such an application is that there is no physical electrical connection. This is good because when you brush your teeth, there is water involved. Charging by induction is able to achieve a water proof protection of the electric charger by providing full insulation. The magnetic fields can easily pass through the plastic housing to charge the electric tooth brush.

Answer 2

Charging by induction is a means of transfering electrical power from one point to another without any physical connection in between. Examples of this kind of electronic process are readily available in the medical field where tiny little pulse generator devices, or electric nerve stimulators are surgically implanted in the human body. These devices run on a tiny battery which can run out of energy over time if not recharged.

Now, it would not be a happy situation if the patient had to be cut open to connect battery charging wires to the implanted device every week or so. It is also not a healthy idea to have charging wires dangling out of an open wound site where the device was inserted.

So, the device designers provided a split-apart transformer arrangement to accomplish the device charging. One half of the transformer is located inside the patient fairly close to the surface of the skin. The other half of the transformer is hand held outside the human body and manipulated so that it is very close to the underskin half.

Magnetic waves from the outside transformer device radiate outward through the skin and strike the implanted half of the transformer. When these magnetic waves pass through the coils of wire in the transformer an electrical current is produced which is used to charge the batteries of the medical device. Neat?

Charging by induction happens all the time in common use of simple battery chargers also. Those chargers use a transformer to step down common household AC Voltage ( 115 VAC ) to something like 6 or 15 VAC. That small voltage is rectified into DC Voltage and used to charge small batteries. The induction being used occurs in the windings of the step down transformer where magnetic waves from the primary winding (115 VAC winding) travel through the core of the transformer and strike the windings of the secondary coil. When those waves pass through the secondary winding they generate a current flow in that winding (induced current flow). And, you can find all kinds of examples of that around the house if you look for wall worts supplying power to computer devices, small radios, some hair driers, and small consumer type electronic organs.

Answer 3

induction is caused by some magnetic interference so if you imagine having a normal watch or similar, placing it near a large power cable with a large voltage the field would induce a charge in the watch circuit.