It normally requres two coils of wire placed close to each other. The AC field on one will induce an AC field in the other.
More chargers of portable equipment are using this method. It requires no physical contact, so reduces problems of poor contacts and can make the item more water proof.
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An example of charging by induction is, charging your socks on carpet by friction then the electrons being transferred through conduction up to your finger. Then, the electrons push the electrons away so the that the door knob becomes positively charged. ;)
Charging by induction means that a charged object produces the opposite charge in a nearby object without touching it.
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Since the needle in a compass is magnetized by induction it loses its magnetism easily by rough contact or heat.
A dry contact is a contact that does not provide voltage. For instance, the push-to-talk switch of a microphone, which just closes a circuit without providing voltage. A wet contact is a contact that will provide voltage when closed, like the switch on the wall that activates the 110 VAC outlet to turn a lamp on in a room. / +------o o---------(o) | +---------------------(o) Dry contact / +------o o---------(o) | --+-- --- Wet contact ------ -+- | +---------------------(o)
Here are technical definitions for the two: Contact Grouting is the filling of voids between a structure (typically a lining) and the host geologic material. Consolidation Grouting is the filling of rock discontinuities. As far as your question concerning the consumption rate of cement for contact grouting it is dependent on numerous variables, the lining method, the quality of the lining, the grouting pressure, the grouting refusal criteria, the timing of the grouting, etc.
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