To find the current (I) in this circuit, we can use Ohm's Law formula:

I = V / R

where:
I = current
V = voltage
R = resistance

Given:
V = 600 W (power)
R = 40 ohms (resistance)

First, let's find the voltage (V) using the power formula:

P = V I
600 W = V I

Since V = 600 W and R = 40 ohms, we need to find I first:

I = V / R
I = 600 W / 40 ohms
I = 15 A

Now, we can find the current (I) in the circuit, which is 15 Amperes.