How To Choose A Resistor For DC Led(s) Circuit?

In this video, I will show you: How to calculate and choose a suitable resistor for DC Led(s) circuit. First to find out the led(s) forward voltage, Second to calculate a resistor's value by determining the circuit's current, Third to choose right size resistor according to work its dissipation out and rechecking the resistor's value & dissipation if it is necessary. Step by step in details.