12 electricity Electro magnetism magnetismMagnetic basicsinduction Resonant magnetic coupling resonance Energy coupling
13Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge.
14Magnetism is a force that acts at a distance dueto a magnetic field
15• It is the tendency of a system to oscillate with larger amplitude at some frequencies than at others.• These are known as the systems resonant frequencies (or resonance frequencies).• At these frequencies, even small periodic driving forces can produce large amplitude oscillations
24Future with wireless electricity• More Convenient• More reliable• Environmental friendly
25What about Safety??• Non- radiative power transfer.• Magnetic Fields are safe for humans and animals.• Highly resonant coupling minimizes energy transfer to “off resonant “ objects• Witricity systems are designed to meet int’l safety guidelines
26Disadvantages•Wireless power transmission can be possibleonly in few meters.•Efficiency is only about 40%.
27 MARKET DEMANDS MarketRapid growth in Mobile phones, portableMobile phone market music players, Bluetooth headsets. Technology DevelopmentRapid improvement in Electromagnetic inductionradio technology efficiency. method surpasses 60% the threshold for regular use. Competing TechnologyLimit of battery technology; Limits to increases in capacity ofDevelopment delay Li-ion batteries.