One of the handy formulas for the power dissipated by
a circuit element is
Power = (current)² x (resistance) .
That certainly seems to be the one to use for this problem,
since we're given the power and the current, and we're asked
to find the resistance.
Power = (current)² x (resistance) .
Divide each side by (current)² :
Resistance = (power) / (current)²
Resistance = (1200W) / (11 A)²
Resistance = 1200 / 121 = 9.917... ohms (rounded)
