Victory for the ACT Student Text 15e

336 • S CIENCE

EXPLANATIONS

15. A new circuit is set up, similar in design to those in the experiments. The battery voltage and the size of the resistors are unknown, but the current measures 0.001 amperes. If the battery voltage is doubled and one of the two resistors is replaced with one having a smaller value, which of the following most accurately describes the new current? A. It will be smaller than 0.001 amperes. B. It will be unchanged. C. It will be greater than 0.001 amperes. D. Cannot be determined from the given information. 16. Which of the following single changes to Experiment 2 would produce a current of 0.004 amperes? F. Decrease the voltage to 8 volts. G. Increase the resistance to 3,000 ohms. H. Neither (F) nor (G) will create a current of 0.004 amperes. J. Either (F) or (G) will create a current of 0.004 amperes.

15. (C) 6FLHQFH 6FLHQWLÀF ,QYHVWLJDWLRQ $SSOL- cation Again, increasing the voltage or decreasing the resistance will cause an increase in current.

16. (J) 6FLHQFH 6FLHQWLÀF ,QYHVWLJDWLRQ $SSOL- cation The current in Experiment 2 is 0.006 am- peres (12 volts/2,000 ohms). To decrease the current to 0.004 amperes, use either an 8-volt battery (8 volts/2,000 ohms) or resistors totaling 3,000 ohms (12 volts/3,000 ohms).