What is the voltage across a resistance of 1 Ohm with a current of 100mA?

To find the voltage across a resistance when the current is known, Ohm's Law (V = I × R) is applied, where V is the voltage, I is the current, and R is the resistance. In this scenario, the resistance is 1 Ohm, and the current is 100mA.

First, convert the current from milliamperes to amperes: 100mA is equal to 0.1A (since 1 A = 1000 mA). Now, applying Ohm's Law:

V = I × R = 0.1A × 1Ω = 0.1V.

This calculation confirms that the voltage across the 1 Ohm resistance with a current of 100mA is indeed 0.1V.

In the context of the other answer choices, while the other values represent different potential voltages derived from varying current or resistance setups, they do not match the result of the calculation based on Ohm's Law in this specific situation. Thus, the selection of 0.1V accurately reflects the principles of circuit analysis as established by Ohm's Law.