Sparky's Journal

📅 March 18, 2026

Why I Kept Messing Up Ohm’s Law

Was getting frustrated because Ohm’s Law is supposed to be “easy” but I kept messing it up.

What I was messing up:

- Not paying attention to units

- Mixing up watts, volts, and amps

- Plugging numbers in without thinking

What clicked:

It wasn’t the formula—it was the units.

Once I slowed down and asked:

“What am I solving for?”  

“What units should the answer be in?”

Everything started lining up.

Also started double checking:

Volts × Amps = Watts

If that didn’t make sense, I knew I messed up somewhere.

Takeaway:

Ohm’s Law isn’t hard—the discipline is.

Next step:

Keep practicing but focus on units every single time.

Ohm's law and the Power (watts) Wheel are key formulaic methods commonly used by Electricians for various calculations encountered in the electrical field. This makes understanding the fundamentals a key priority for studying apprentices.

Let's begin with the principles of Ohm's law, published by German physicist Georg Simon Ohm in his 1827 “The Galvanic Circuit Investigated Mathematically” titled book, describing the law of his discoveries on the relationship of (E)voltage also known as (V)Volts discovered by Alessandro Voltas invention of the voltaic pile, the first battery, (I)current also known as (A) Amperage discovered by Andre-Marie Ampere when learned electrical currents create magnetic fields inspired by another physicist Hans Christian Oersted, and (R)resistance also known as the (Ω)Ohm which the symbol is an ode to. Inspired by the discovery of electromagnetism and experiments using voltaic piles (alternating disks of different metals, separated by material soaked in electrolytes), wires, and a galvanometer (a tool that detects and measures small electric currents by deflecting light beams). Over a few years, he realized that current is directly proportional to voltage and inversely proportional to resistance. Applying mathematical formulae to this, his theory of the equation V = I x R (Voltage = Current x Resistance) was discovered.

Finally The (W)Watt or (P)Power the rate at which energy is produced, named after the Scottish mechanical engineer James Watt, who primarily improved steam engines, and discovered the unit horsepower, which is 746 watts (1 horsepower) 

All thanks to Michael Faraday's research on electromagnetic induction.