Bonuses 26. For an RLC circuit, which of the following statement is/are correct

Question

Bonuses 26. For an RLC circuit, which of the following statement is/are correct concerning the phases of the voltage and current? A) The current is in phase with the voltage through the resistor (R) B) The current leads the voltage through the inductor (L.). he current lags the voltage through the capacitor (C). D) All of the above. E) None of the above. 27. Suppose that the nearest electric line has an rms voltage of 5,000 v. The transformer to bring the voltage down to 120 v has 30 turns in the secondary coil. How many turns must the primary coil contain? A) 333 B) 776 C) 933 D) 1,250 E) 1,745 F) 1,833

Explanation / Answer

Ans 26. In any RLC circuit, the phase relationship between voltages and currents for RLC is as follows

i) Resistor: Current and voltage are in phase.

ii) Inductor: Voltage leads the current.

iii) Capacitor: Current leads the voltage.

Hence option A is correct

Ans 27: Using Es / E p = ns / np to find the number of turns in the primary coil.

np = (Ep/ Es )x(ns) , E p = 5000 V , Es = 120 V and ns = 30

Therefore np = (5000/120)x30 = 1250

Hence option D is correct

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