The Four Ohm's Law Relationships
| Find | Formula | Alternates |
|---|---|---|
| Voltage (V) | V = I × R | V = P / I, V = √(P × R) |
| Current (I) | I = V / R | I = P / V, I = √(P / R) |
| Resistance (R) | R = V / I | R = V² / P, R = P / I² |
| Power (P) | P = V × I | P = V² / R, P = I² × R |
Common Household Values
| Appliance | Voltage | Typical Watts | Amps (@ voltage) |
|---|---|---|---|
| LED bulb | 120V | 10W | 0.08A |
| Laptop charger | 120V | 65W | 0.54A |
| Microwave | 120V | 1,000W | 8.3A |
| Electric stove | 240V | 3,000W | 12.5A |
| EV charger (Level 2) | 240V | 7,200W | 30A |