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Switched-mode power supplies have become widespread in the early twenty-first century; they are smaller and lighter than the once-universal transformer converters, and are often designed to work from AC mains at any voltage between 100 and 250 V. Additionally, because they are typically rectified to operate at a DC voltage, they are minimally ...
Aircraft often use 400 Hz power internally, so 50 Hz or 60 Hz to 400 Hz frequency conversion is needed for use in the ground power unit used to power the airplane while it is on the ground. Conversely, internal 400 Hz internal power may be converted to 50 Hz or 60 Hz for convenience power outlets available to passengers during flight.
At low frequencies (such as the line frequency of 50 or 60 Hz), designers can usually ignore the skin effect. For these frequencies, the skin effect is only significant when the conductors are large, more than 0.3 inches (7.6 mm) in diameter. Switching power supplies must pay more attention to the skin effect because it is a source of power loss.
A former director at a Massachusetts migrant shelter is speaking out against what he says were incidents of widespread violence, child sexual assault and rape at shelters in the state, including ...
In a year in which it seemed every great luminary got a moment under the documentary lens, it can be a bit difficult to parse out which were must-see. This list will have you covered.
Luigi Mangione, the man accused of murdering UnitedHealthcare CEO Brian Thompson, was told "don't say a word" by his lawyer in court, following an outburst outside the hearing at a Pennsylvania ...
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