If a current of 2 amps is moving through a circuit connected to a 9 V battery, what is the resistance of the circuit?

Answer 1

7 ohms
4.5 ohms
18 ohms
0.2 ohms
?

Answer 2

E = volts = 9 v = voltage
I = 2 amperes = current
R = E/I = 9/2 = ? ohms resistance.