Ohm's Law

Ohm's Law

Ohm's Law is the most fundamental relationship in circuit analysis:

V = I · R

Where:

• V = voltage across the resistor (volts, V)
• I = current through the resistor (amperes, A)
• R = resistance (ohms, Ω)

The Three Forms

Rearranging gives you the form you need:

I = V / R     (find current from voltage and resistance)
V = I · R     (find voltage from current and resistance)
R = V / I     (find resistance from voltage and current)

Physical Intuition

Think of a resistor as a pipe carrying water:

• Voltage is the pressure pushing the water
• Current is the flow rate
• Resistance is how narrow the pipe is

Double the pressure (voltage) → double the flow (current). Double the pipe restriction (resistance) → half the flow.

Examples

Your Task

Implement double ohms_law(double v, double r) that returns the current through a resistor given voltage v and resistance r.