Select the correct Ohm’s law rearrangement: which formula gives current I when voltage V and resistance R are known (identify the valid relationship)?

Introduction / Context:
Ohm’s law relates voltage, current, and resistance. Being able to rearrange this relationship is vital when solving for a specific variable in circuit problems or lab measurements.

Given Data / Assumptions:

• Canonical form: V = I * R.
• We need I in terms of V and R.
• Assume ideal linear resistor behavior.

Concept / Approach:

From V = I * R, divide both sides by R to isolate current. Ensure the units are consistent: volts divided by ohms yields amperes, confirming dimensional correctness.

Step-by-Step Solution:

Verification / Alternative check:

Unit check: V / Ω = A, which is the SI unit for current.

Why Other Options Are Wrong:

I = V R multiplies instead of divides; I = R / V inverts the correct ratio; V = I R is true but solves for V, not I.

Common Pitfalls:

Mixing up division/multiplication when isolating variables; not checking units as a safeguard.

Final Answer:

I = V/R