Question
Download Solution PDFA sinusoidal alternating voltage of time period 36 ms has the maximum value of 250 V. Its value will reach -125 V (half the value of negative maximum) after ______ milliseconds.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
A sinusoidal voltage can be expressed as:
where, Vm = Maximum value of input voltage
ϕ = Phase difference
T = Time period
Calculation
Given, Vm = 250 V
T = 36 ms
t = 21 ms
Mistake Points Remember that time should be always positive that's why sin-1(-0.5) = 7
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