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Q. On a per-phase basis, let v = √2 V cos ωt and i = √2 I cos (ωt - θ).
(a) Express the instantaneous power s(t) in terms of real power P and reactive power Q.
(b) Now consider the energy E associated with the instantaneous power and show that E = Pt, where t is the duration of the time interval in seconds.
Conductors with a temperature rating of 75 degrees C are run in an area with an ambient temperature of 55 degrees C. What would be the de-rating factor that should be applied?
Explain a couple
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Describe the construction of lead acid battery
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List four sources of information which are essential to the designer of this electrical installation
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