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SUBJECT NATURAL SCIENCES Grade SCIENCE 11th
SUBJECT NATURAL SCIENCES Grade SCIENCE 11th

... conclude  that resistance is  directly proportional to the length and  inversely  proportional  to  the  cross­sectional  area  of  the  conductive  cable.  Consequently,  the  blue  cable  has  the  highest  resistance as it is  longer and thinner, next are the yellow and red  cables  with the  sam ...
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... quiescent current when operating and only 3µA in shutdown. Selectable active-high/active-low control logic and shutdown control provide additional flexibility. An autoreset feature latches the switch off in the event of a short circuit, saving system power. The switch reactivates upon removal of the ...
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J. Santiago-Gonzalez, K.M. Elbaggari, K.K. Afridi and D.J. Perreault, “Design of Class E Resonant Rectifiers and Diode Evaluation for VHF Power Conversion,” IEEE Transactions on Power Electronics, Vol.30, No. 9, pp. 4960-4972, 2015.
J. Santiago-Gonzalez, K.M. Elbaggari, K.K. Afridi and D.J. Perreault, “Design of Class E Resonant Rectifiers and Diode Evaluation for VHF Power Conversion,” IEEE Transactions on Power Electronics, Vol.30, No. 9, pp. 4960-4972, 2015.

... biased at the output dc voltage. We are able to disregard the effect of the input-side resonant tank as the input current is sinusoidal and the input network is tuned on resonance. The diode turns off when the current through it (iL – iIN) reaches zero (at t = 0). At this instant the capacitor acros ...
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Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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