Final answer:
The resistance of an electric appliance marked 220 V and 550 W is calculated using the power equation, resulting in a resistance of 88 ohms.
Step-by-step explanation:
The question you've asked is related to Ohm's law and the power equation in physics. To determine the resistance of an electric appliance rated at 220 V and 550 W while in use, we can use the formula for power (P) which is equal to voltage squared divided by resistance (R), i.e. P = V^2 / R. Rearranging this equation to solve for resistance, we get R = V^2 / P.
- First, insert the values into the equation: R = (220 V)^2 / 550 W
- Next, calculate the result: R = 48400 V^2 / 550 W = 88 ohms.
Therefore, the resistance of the appliance in use is 88 ohms.