Using Ohm's law, which formula is used to calculate resistance?

Using Ohm's law, which formula is used to calculate resistance?

• A. R = I × E
• B. R = E ÷ I
• C. R = I ÷ E
• D. R = E + I

Answer: (B)

The formula used to calculate resistance based on Ohm's Law is derived from its basic relationship, which states that voltage (E) is equal to current (I) times resistance (R). To isolate resistance, the formula can be rearranged to R = E ÷ I. This relationship shows that resistance is equal to the voltage across a conductor divided by the current flowing through it.

Understanding this concept is crucial in electrical work because it allows professionals to assess the resistance in a circuit based on measurable values of voltage and current. By knowing how these elements interact, electricians can troubleshoot issues and design circuits that function within the desired specifications.