Watt

The watt (symbol: W) is the unit of measurement of the Power of the International System and is equivalent to 1 Joule per second: 1 J / s or it is the instantaneous power produced or consumed.

Note: Joule is the obstacle that faces the current when it passes through a conductor

In electrical units, it is equivalent to 1 volt multiplied by ampere: W = V * A, which in electrical engineering is equal to the electrical power (P) that passes through a section of the circuit and is given by the product of voltage (V) and current (I) present in the section considered:

P = V × I (Unit of measurement of power is Watt, abbreviated: W)

Some of the most used multiples and submultiples:

• Milliwatt (mW) = 10-³ w = 0.001 w
• Kilowatts (kW) = 10³ w = 1000 w
• Megawatt (Mw) = 10⁶ w = 1,000,000 w
• Gigawatt (Gw) = 10⁹w = 1,000,000,000 w
• Terawatt (Tw) = 10¹² w = 1,000,000,000,000 w

Summary table of OHM's law

P = POWER (Watt)

P = V * I (W) if I replace V with R *  I  we will have P = R * I² if I replace I in the formula with V / R we will have P = V² / R

V = VOLTAGE (Volt)

V = R * I (Volt) if I replace I with P / V we would have V² = R * P = 

If I replace R with V / I in the formula, we will have that V = V / I * I = P / I since P = V * I

R = Resistance (OHM = Ω)

R = V / I if I replace V with P / I we will have R = P / I² if instead I replace I with P / V we will have R = V / P / V and finally       R = V² / P

I = Current (Ampere)

I = V / R if I replace R with V / I we will have V / V / I and since V * I = P we will have I = P / V; if I replace the V with R * I in the formula I = P / V we will have that: I² = P / R so:

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