What is the resistance of a bathroom heating unit that draws 10 amperes at 115.5 volts?

• A. 10 ohms
• B. 11.5 ohms
• C. 12.5 ohms
• D. 13 ohms

Answer: (B)

To determine the resistance of the bathroom heating unit, we can use Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R). The formula can be rearranged to find resistance: R = V / I.

In this scenario, the heating unit draws 10 amperes of current at a voltage of 115.5 volts. Substituting these values into the formula gives:

R = 115.5 volts / 10 amperes = 11.55 ohms.

Rounding to a reasonable number of significant figures, we can express this as 11.5 ohms. Therefore, the calculation confirms that the resistance of the heating unit is indeed 11.5 ohms. This answer directly follows from the application of Ohm's Law, confirming the relationship between voltage, current, and resistance in electrical circuits.