The amount of electrical current that flows through a wire is inversely proportional to the resistance in that wire. A wire originally carries 4 amperes of electrical current. Then the resistance is reduced to one-fifth of its original value. How many amperes of electrical current will flow through the wire?  Select:
A) 0.8
B) 5
C) 12
D) 20
E) 24
Given that, I∝1/R, I*R is a constant value.   I1*R1 = I2*R2   I1*R1 = I2*R1/5   I2 = 5*I1 = 20 amperes   The answer is 20.
<result>D</result>
The amount of electrical current that flows through a wire is inversely proportional to the resistance in that wire. A wire originally carries 4 amperes of electrical current. Then the resistance is reduced to one-fifth of its original value. How many amperes of electrical current will flow through the wire?