# Series Circuits – Exercise – 1

Series Circuits » Exercise – 1

1. A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is ________.

(a) 0 V
(b) 1.2 V
(c) 6 V
(d) 0.6 V

Explanation
Explanation : No answer description available for this question. Let us discuss.
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2. A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 Ω. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is ________.

(a) 27 mA
(b) 2.7 mA
(c) 19 mA
(d) 190 mA

Explanation
Explanation : Total P = P1 + P2 + P3 = 7/8w. P = I2R. I = sqrt (P/R) Now, P = 7/8w, R = 1200 ohm. Therefore, I= sqrt ( (7/8)/1200 ) = 0.0270030862 = 27 mA. Let us discuss.
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3. Which of the following series combinations dissipates the most power when connected across a 120 V source?

(a) one 220 Ω resistor
(b) two 220 Ω resistors
(c) three 220 Ω resistors
(d) four 220 Ω resistors

Explanation
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4. A series circuit consists of three resistors with values of 120 Ω, 270 Ω, and 330 Ω. The total resistance is ________.

(a) less than 120 Ω
(b) the average of the values
(c) 720 Ω
(d) 120 Ω

Explanation
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5. When a fourth resistor is connected in series with three resistors, the total resistance ________.

(a) increases by one-fourth
(b) increases
(c) decreases
(d) remains the same

Explanation
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