A circuit is wired with a power supply, a resistor and an ammeter (for measuring current). The ammeter reads a current of 24 mA (milliAmps).

question: Determine the new current if the voltage of the power supply was decreased by a factor of 2 and the resistance was held constant.

a. 12 mA
b. 24 mA
c. 48 mA
d. 72 mA