Practace E.cam # Consider the three electric circuits marked with X, Y and /Z as

Question

Practace E.cam # Consider the three electric circuits marked with X, Y and /Z as shown in the figure. All the resistors and all the batteries are identical, and all the batteries are ideal RIR 2 pt Select the circuit with the smallest voltage drop across a single resistor 20.AO circuits X, Y and Z, 3-way tie BO circuits X and Y, tie for smallest CO circuit Y DO circuit X EO circuit Z FO circuits Y and Z, tie for smallest GO circuits X and Z, tie for smallest 2 pt Select the circuit with the smallest current through a single resistor 21.AO circuit X BO circuit Y CO circuits X and Y, tie for smallest DO circuits X and Z, tie for smallest EO circuit Z FO circuits Y and Z, tie for smallest GO circuits X, Y and Z, 3-way tie 2 pt Rank the total power dissipated by the entire circuit from lowest to highest. (Lowest first, highest last.) 22.AC) Y, X, Z BO Y, Z, X CO Z, Y, X EO Z, X, Y FO X, Y, Z

Explanation / Answer

20) The answer is circuit Y. In case of X the whole voltage drops across the resistor R and in case of Z as the two resistors are in parallel configuration the case remains the same as X. Therefore, the anwser is Y circuit where the resistors are in series and hence the potential falls in parts across the two resistors. The correct option is C.

21) The answer for this case will be circuit Z. In case of X and Y we have series cricuits and hence the same value of current flows through the resistors while in case of Z we have a parallel circuit and hence the value of current get's divided into two parts. Hence the correct option is E.

22) Y will have the highest power dissipation as the value of resistance is 2R in this case, X will come into rank as the value of resistance is R and the lowest power will be dissipated in Z where resistance is R/2. Hence the correct option is E.

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