**What is Ohm’s Law?**

Provide that the physical state of the conductor kept constant, the current flowing through the conductor is directly proportional to the potential difference between the terminals of the conductor.

OR

If the temperature of the wire/conductor is constant, then the current flowing through the conductor is directly proportional to the voltage across the terminals of the conductor.

I∝V

I=V/R

1/R=Proportionality constant.

R=Resistance of the conductor. Electric current=Voltage/Resistance.

**Why is Ohms Law important?** Ohm’s Law is the relationship between power, voltage, current and resistance. These are the very basic electrical units we work with. The principles apply to alternating current (ac), direct current (dc), or radiofrequency (rf).

**The Electrical Components of Ohm’s Law**

1)**Voltage ** The electrical “pressure” that causes free electrons to travel through an electrical circuit. Also known as electromotive force (emf). It is measured in volts.

2) **Resistance**

That characteristic of a medium which opposes the flow of electrical current through itself. Resistance is measured in ohms.

3) **Current**

The amount of electrical charge (the number of free electrons) moving past a given point in an electrical circuit per unit of time Current is measured in amperes.

4) **Power**

The amount of current times the voltage level at a given point measured in wattage or watts.

**Characteristics Of Ohm’s Law**

i) **Voltage:** Difference of potential, electromotive force, ability to do work. Unit of measure Volt Symbol “E” or “V” Compares to Pressure in a gas or liquid system.

ii) **Current: **Flow of electrons Unit of measure Ampere Symbol “I” Compares to The flow of gas or liquid in a piping system.

iii) **Resistance**: Opposition to current flow Unit of measure Ohm often seen as the Greek letter Omega Symbol “R” Compares to Orifice effect or the size restriction of inside pipe Diameter.

**Limitations of Ohm’s Law**

The limitations of the Ohm’s law are,

1) It is not applicable to nonlinear devices such as diodes, Zener diodes, voltage regulators, etc.

2) It does not hold good for non-metallic conductors such as silicon carbide. The law for such conductors is given by,

V = k I^m

where k, m are constants.

where k, m are constants.

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