what is the value of the resistor?

Question

The current in a loop circuit that has a resistance of R_1 is 2.00 A. The circuit is reduced to a 1.60 A when an additional resistor R_2=3.00 ohm is added in series with R_1. What is the value of R_1.

Answer 1

I = V / R
find the voltage in the first part
V = I * R = 2R

now plug it in to the second part resistors are in series and voltage is the same
2R = 1.6A (R + 3ohm)
R = 7.5 ohms

Answer 2

Your teacher must have taught you Ohms law. If not, look it up. There, you will find your answer.

Answer 3

quit cheating on your homework!,look it up and learn,youll live to appreciate it,lol