Which equation would you use to find voltage if current and resistance are known?

• A. E = R/I
• B. E = I/R
• C. E = I x R
• D. E = R x I

Answer: (C)

The appropriate equation to find voltage when current and resistance are known is represented by the formula E = I x R. In this context:

• E represents the voltage (in volts),

• I represents the current (in amperes),

• R represents the resistance (in ohms).

This equation is derived from Ohm's Law, which states that the voltage across a conductor is directly proportional to the current flowing through it and the resistance of the conductor. By rearranging the formula for Ohm's Law, you can easily see how it relates the three variables.

In practical terms, if you know the current flowing through an electrical circuit and the resistance that opposes that current, multiplying these two values will give you the voltage across that resistance. This relationship is fundamental in electrical engineering and is widely used in calculations related to circuits.

The other options you mentioned reflect incorrect formulations or relationships of Ohm's Law.