wireless electricity essay in 2000 words Solution wireless electricity is the method of transmission of electricity without the use of man-made conductors. This is a modern and hi-tech way of transmitting electrical energy. It is mostly used in cases when it is difficult or impossible to transfer electricity using traditional methods. Generally conducting wires are used to transmit electricity over an area. Wireless electricity implemented by different methods 1.Inductive coupling 2.Radio frequency harvesting 3.Magnetically coupled resonance One of the most common ways of achieving wireless transmission of electricity is direct induction and resonant magnetic induction. There are other ways of achieving this too, like electrical conduction and electromagnetic radiation. In direct induction, two conductors are coupled such that changes in current in one conductor induces voltage in the other conductor.This happens due to electromagnetic induction. Transformers use this method. In resonant magnetic induction, the energy is transferred between two wires which are tuned at the same frequency. The machine used for this purpose is known as resonance transformer. These two methods done in the given order help in transmission of electricity in wireless fashion. Electromagnetic radiations used are microwaves or lasers. Electromagnetic induction can also be used for wireless transmission. It can be magnetic or capacitive in nature. Capacitive coupling is also known as an electrostatic induction method. With laser or microwave method, power transmission can be made more directional. In systems of coupled resonances, there is often a general \"Strongly Coupled\" regime of operation. If one can operate in that regime in a given system, Midrange power transfer implemented in this way can be nearly omni directional and efficient, irrespective of the geometry of the surrounding space, with low interference and losses into environmental objects. The above considerations apply irrespective of the physical nature of the resonances. Magnetic resonances are particularly suitable for everyday applications because most of the common materials do not interact with Magnetic Fields, so interactions with Environmental objects are suppressed even further. We were able to identify the strongly coupled regime in the system of two coupled magnetic resonances by exploring Non-radioactive (near-field) magnetic resonant induction at Megahertz frequencies. Why wireless electricity needed Now a days there is a Rapid development of autonomous electronics like laptops, cell-phones, house-hold robots and all the above devices typically rely on chemical energy storage(Battery) .As they are becoming daily needs to present generation, Wireless energy transfer would be useful for many applications as above and they need midrange energy. Currently, wired electricity powers nearly everything. It travels through wires in the form of Alternating Current, and powers most of our devices in .

1. Wireless local-area networks (LANs) have greater risks than wired LANs in which of the
following areas?
Masquerading and modification/substitution
Modification/substitution of messages and theft of equipment
Eavesdropping and masquerading
Eavesdropping and theft of equipment
Solution
b. In wireless LANs, the stronger node could block the weaker one, substitute its own messages,
and even acknowledge responses from other nodes. Similarly, theft of equipment is a major risk
in wireless LANs due to their portability. When equipment moves around, things can easily
become missing.