Choose the best answers 1) Four unequal resistors are connected in a series drcu

Question

Choose the best answers 1) Four unequal resistors are connected in a series drcuit. Which one of the following statements is correct about this circuit? A) The total resistance is equal to any one of the resistors. B) The total resistance is less than the smallest resistor. C) The total resistance is equal to average of the four resistors. D) The total resistance is more than the largest resistor E) The total resistance is less than the largest resistor 2) Four unequal resistors are connected in a parallel dircuit. Which one of the following statements is correct about this circuit? A) The total resistance is less than the smallest resistor. B) The total resistance is equal to average of the four resistors C) The total resistance is more than the largest resistor. D) The total resistance is equal to the average of the resistance of all the resistors E) None of the other answers is correct. 3) A surface on which all points are at the same potential is referred to as 3) A) a constant electric field surface. B) a dielectric surface. C) an equipotential surface. D) a constant electric force surface. E) an equivoltage surface. 4) Which of the following expression(s) represents the electrical energy stored by a capacitor? 4) A) 022c B) CV2/2 c) Qv2 D) All of the expressions are correct E) None of the expressions is correct Figure 21-4 20 40 80 100V 100 V DC signal is applied to four resistors as shown in Figure 21-4. The values of the resistors 20Q, 40Q,60Q,and 80 . What is the voltage across the 40 resistor? 1) 80 V B) 20 V C) 60 V D) 40 V E) 100 V

Explanation / Answer

1. Req = R1 + R2 + R3 + R4

Req > R ,

Ans (D )

2. for parallel,

1/Req = 1/R1 + 1/R2 + 1/R3 + 1/R4

so Req < R

Ans: (A)

3. (C)

4. U = C V^2 / 2 = (C V) V / 2 = Q V / 2

{ Q = C V}

U = Q V / 2 = (Q/2)(Q/C) = Q^2 / 2C

Ans: (D)

5. V = (100)(40) / (40 + 20 + 60 + 80) = 20 V  

Ans(B)

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