Answer : Resistance of the dishwasher is 6.67 ohms.
Explanation :
It is given that,
Total voltage flowing in a house, V = 120 V
Current flowing, I = 18 A
According to Ohm's law :
V = I R ...........(1)
R is the resistance of the circuit.
Putting all values in (1) we get :



or

So, the resistance of the dishwasher is
.