In a given circuit, the supplied voltage is 1.5 volts, and the resistor value is 3 ohms. use ohm's law to determine the current in the circuit.
2.0 amps
0.5 amps
4.5 amps
1.5 amps

One form of Ohm's Law is

                   Current = (voltage) / (resistance)  .

If that 3-ohm resistor is the entire circuit ... it's the only component
connected across the supply of power ... then

                   Current  =  (1.5 volts) / (3 ohms)  =  0.5 Amperes  .