Ohm’s Law

1. Definition

Ohm’s law states that The amount of electric current flowing in a wire depends on the voltage pushing it and the resistance slowing it down.

1.1. In Formula Form

V = I . R

Where:

  • V = Voltage (push)
  • I = Current (flow)
  • R = Resistance (opposition)

1.2. Other Variations

Ohm's Law Mnemonic Principle

1.3. Unit of Measurements

The standard unit of measurements in ohm’s law are:

  • Volts represented by V for Voltage
  • Amperes represented by A for Current
  • Ohms represented by Ω for Resistance

1.4. Example

If V = 12 and R = 6Ω , then I = V/R which is I = 12/6 = 2A.

2. Usage

2.1 Calculations

Ohm’s Law helps you calculate:

  • Current if you know voltage and resistance: I=V/R

  • Voltage if you know current and resistance: V=IR

  • Resistance if you know voltage and current: R=V/I

2.1 Applications

It is used in:

  • Designing electrical circuits
  • Checking if a power supply can handle a load
  • Troubleshooting why a circuit isn’t working properly
  • Choosing the right resistor for LEDs, motors, and other components.

3. Limitations

It is important to note that ohm’s law has the following limitations:

  • It only applies to ohmic materials (where resistance is constant regardless of voltage or current).

  • It doesn’t work for devices like diodes or transistors where the relationship isn’t linear.

4. Video Explanation

video coming soon