## series circuits ###### 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
 ANS: B - increases

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###### 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
 ANS: C - 6 V

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###### A series circuit consists of three resistors with values of 120 , 270 , and 330 . The total resistance is
 A less than 120 B the average of the values C 720 D 120 ANS: C - 720 No answer description available for this question

###### 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 . 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
 ANS: A - 27 mA

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.

###### Which of the following series combinations dissipates the most power when connected across a 120 V source?
 A one 220 resistor B two 220 resistors C three 220 resistors D four 220 resistors
 ANS: A - one 220 resistor

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###### When one of three series resistors is removed from a circuit and the circuit is reconnected, the current
 A increases B ncreases by one-third C decreases by one-third D decreases by the amount of current through the removed resistor
 ANS: A - increases

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###### The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
 A 12 W B 48 W C 3 W D 8 W
 ANS: C - 3 W

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###### The following resistors (one each) are connected in a series circuit: 470 , 680 , 1 k , and 1.2 k . The voltage source is 20 V. Current through the 680 resistor is approximately
 A 60 mA B 30 mA C 6 mA D 300 mA
 ANS: B - 30 mA

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###### A series circuit consists of a 4.7 k , a 12 k , and a 2.2 k resistor. The resistor that has the most voltage drop is
 A the 12 k B the 2.2 k C the 4.7 k D impossible to determine from the given information
 ANS: A - the 12 k No answer description available for this question

###### All the voltage drops and the source voltage added together in a series circuit is equal to
A
 the total of the voltage drops

B   the source voltage
C   zero
D   the total of the source voltage and the voltage drops
 ANS: C - zero

No answer description available for this question 