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MEASUREMENT OF DC AND AC VOLTAGE AND CURRENT
MEASUREMENT OF DC AND AC VOLTAGE AND CURRENT

... multimeter with diode rectifier. Explain why the multimeter readings differ for every waveform and amplitude. Use a multimeter also for frequency measurement of every waveform. 4) Repeat task 3 for harmonic, rectangular, triangular, saw-tooth waveform with DC offset set to 1V. Measure the output vol ...
VIGI-Lux IR Illuminator MVS 5760 Series
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Electricity and Electronics
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... • Wire-wound resistors have a label indicating resistance and power ratings. • A majority of resistors have color bars to indicate their resistance magnitude. • There are usually 4 to 6 bands of color on a resistor. As shown in the figure below, the right most color bar indicates the resistor reliab ...
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... Then input terminal voltage is set to more than VSS. (Note 4) An excessive input current will flow when input voltages of more than VDD+0.6V or less than VSS-0.6V are applied. The input current can be set to less than the rated current by adding a limiting resistor. Caution: Operating the IC over th ...
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... changes direction in the circuit. In the U.S. this changing current is called 60 cycle or 60 hz AC since it completes 60 cycles of positive and negative direction each second. AC is produced by the power companies and is the electric energy we use in the home to provide energy to most devices. The t ...
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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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