# A Simply Awesome Explanation of the Ohm's Law

Ohm's Law is known for its simplicity and usefulness in the field of electrical and electronic engineering. It applies to electric circuits and gives the relationship between three electrical quantities; current, voltage, and resistance.

ScienceStruck Staff

Last Updated: Jan 16, 2019

Parameters involved in Ohm's Law

The different parameters involved in Ohm's Law are voltage, current, resistance, and power.

✧ Voltage (V/E) is the potential difference between two points in a circuit and is measured in volts (V).

✧ Current (I) is the flow of electric charge from negative to positive on the conductor surface and is measured in amperes (A) or amps.

✧ Voltage (V/E) is the potential difference between two points in a circuit and is measured in volts (V).

✧ Current (I) is the flow of electric charge from negative to positive on the conductor surface and is measured in amperes (A) or amps.

Ohm's Law's Mathematical Equation

Ohm's Law's Mathematical Equation is the simplest and most important equation that can be used while designing or analyzing circuits. According to Ohm's Law;

Using this simple mathematical equation, one could use the two known parameters to find the third unknown parameter.

**Current (I) = Voltage (V) / Resistance (R)**Using this simple mathematical equation, one could use the two known parameters to find the third unknown parameter.

**Resistance (R) = Voltage (V) / Current (I)**

**Voltage (V) = Current (I) × Resistance (R)**

The above equations can be used to calculate the current through resistors, voltage drops across resistors, output power, and power ratings of resistors.

**P = V × I**

Since V = IR, by substituting this in the power equation P = VI, we get

**P = I × R × I**

E = IR (Since E, electromotive force = potential difference, V)

R = E/I

I = E/R

P = EI

E = P/I

I = P/E.

P = I2R

R = P/I2

I = sqrt (P/R)

P = E2/R

R = E2/P

E = sqrt (PR)