Ohm's law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it and inversely proportional to the resistance (R) of the conductor. Mathematically, this can be expressed as:

I = V/R

In this case, we have a 9-volt battery and a bulb with a resistance of 3 ohms. Substituting these values into the formula above, we get:

I = 9V / 3Ω

= 3A

Therefore, the current flowing through the circuit is 3 Amperes.