The circuit in a particular walkie talkie has a total resistance of 450 ohms and the battery is supplying 9 V how much current in amps (a) is flowing?

Answer 1

The underlying formula that you want to use to solve here is based on Ohm's Law

current(I) = voltage(V) / resistance (R)

for this scenario that becomes

I = 9V / 450 ohms = 0.02A

meaning that the current flowing through the walkie talkie circuit is 0.02A

Answer 2

the voltage is the current times the resistance in this case which means that we can solve for the current

V = I R

I = V / R = 9 volts / 450 ohms = 0.02 amps