I apologize, but I'm not familiar with the "GRASS" method for calculating currents in electrical circuits. However, I can help you use Ohm's law to calculate the current in this scenario.
Ohm's Law states that:
Current (I) = Voltage (V) / Resistance (R)
Given that the toaster has a resistance of 28 Ω and is plugged into a 110 V circuit, we can calculate the current as follows:
Current (I) = 110 V / 28 Ω Current (I) ≈ 3.93 Amperes (A)
So, the current measured in the circuit when the toaster is plugged in would be approximately 3.93 Amperes.