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Your Answers
Correct Q1)
Three identical light bulbs are connected to a battery as shown below. Which one of the following statements is true?
A. All three bulbs will have the same brightness.(Your Answer)(Correct) B. The bulb between X and Y will be the brightest. C. The bulb between Y and Z will be the brightest. D. The bulb between Z and the battery will be the brightest Explanation:The current in a series circuit is the same at each resistor present in the circuit. Since each light bulb has the same resistance ("identical bulbs") and the same current, they will have the same power output (P = I^2R) Thus, they will shine with the same brightness.
Correct Q2)
Three 5 ohm resistors placed in series would provide a resistance which is equivalent to one _____ ohm resistor. 15(Your Answer) Possible correct answers: 15
Explanation:Use the equation for the equivalent resistance of a series circuit: Req = R1 + R2 + R3 + ...
Incorrect Q3)
Three identical light bulbs are connected to a battery as shown at the right. Which adjustments could be made to the circuit that would increase the current being measured at X? List all that apply.
A. Increase the resistance of one of the bulbs. B. Increase the resistance of two of the bulbs. C. Decrease the resistance of two of the bulbs.(Your Answer)(Correct) D. Increase the voltage of the battery.(missed) E. Decrease the voltage of the battery. Explanation:The current at location X is the same as the current at the battery location. To increase the value of the current at the battery, it would be necessary to increase the battery voltage (choice D) or to decrease the equivalent resistance. Since the equivalent resistance is the sum of the resistance of the individual resistors, any decrease of resistance or removal of a resistor will lead to a decrease in the equivalent resistance.
Correct Q4)
Compare circuit X and Y below. Each are powered by a 12-volt battery. The voltage drop across the 12-ohm resistor in circuit Y is ____ (larger, same as, smaller) than the voltage drop across the single resistor in X.
smaller(Your Answer) Possible correct answers: smaller Explanation:The voltage gained at the battery is equal to the accumulative voltage drop when passing through the external circuit. In circuit X, the voltage drop across the single resistor must be 12 V. In circuit Y, the voltage drop across the 12 ohm resistor must be less than 12 V since there will be an additional voltage drop in the 6 ohm resistor. In fact, one might reason that the two voltage drops in circuit Y will be 8 volts and 4 volts respectively, to add to a total voltage drop of 12 volts.
Correct Q5)
Three resistors are connected in series. If placed in a circuit with a 12-volt power supply. The total circuit current is ____ A.
0.316(Your Answer) Possible correct answers: 0.316 Explanation:The calculation is shown here: Itot = Vbattery / Req = (12 V) / (38 ) = 0.31579 A