Ohm's Law
What is Ohm's Law?
Ohm's Law is one of the most fundamental formulas in electrical engineering. It states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance.
The Magic Triangle
The relationship is best described with the formula:
V = I × R
- V (Voltage): The push or pressure of electricity (measured in Volts).
- I (Current): The flow of electrons (measured in Amps).
- R (Resistance): The opposition to flow (measured in Ohms Ω).
Power Calculation
By combining Ohm's Law with the Power formula ($ P = V \times I $), we can derive other useful relationships:
- $ P = I^2 \times R $
- $ P = V^2 / R $
Real World Example
If you have a 9V battery and you connect it to an LED with a 330Ω resistor, you can calculate the current flowing through it to ensure you don't burn out the LED.