Ohm's law describes the mathematical relationship between which set of quantities used to calculate basic circuit behavior?

Introduction:
This question reinforces the definition of Ohm's law from a descriptive angle. Correctly identifying the variables tied by the law is essential for solving everyday circuit problems, from selecting series resistors for LEDs to estimating supply current.

Given Data / Assumptions:

• Ohmic components with linear V–I behavior.
• Steady-state conditions for DC, or instantaneous relationships for resistive AC.

Concept / Approach:
Ohm's law: V = I * R links voltage (V), current (I), and resistance (R). Units (ohms, kilohms, megohms) are scales of resistance, not separate physical quantities governed by the law.

Step-by-Step Solution:
Recognize variables: resistance (R), voltage (V), current (I).Recall the identity: V = I * R.Derive forms: I = V / R and R = V / I.Apply to examples: choose R to set I for a given V in a simple series circuit.

Verification / Alternative check:
Plotting measured current against applied voltage for a fixed resistor yields a straight line with slope 1/R, confirming the relationship between the three quantities.

Why Other Options Are Wrong:

• ohms, kilohms, and megohms: Merely unit prefixes for resistance.
• resistor size and resistor value: Physical size does not define the Ohm's law relationship.
• none of the above / power factor set: Do not describe Ohm's law.

Common Pitfalls:

• Assuming large physical resistors always have large resistance; power rating and resistance are different specifications.
• Confusing derived power equations with the primary Ohm's law identity.

Final Answer:
resistance, voltage, and current