Young electronic hobbyists and enthusiasts are often confused and wonder how to calculate LED and its resistor in a circuit, since they find it difficult to optimize voltage and current through the group of LEDs, required to maintain an optimum brightness. Why we need to Calculate LEDs Designing...
For example with a1 watt LEDconnected directly to this circuit without a resistor would show a voltage equal to forward voltage drop of the LED (3.3V), this is because the LED is sinking almost all the current available from the capacitor. However the voltage across the LED is not dropping...
To get this to happen you can use a transistor or relay with second, larger resistor connected directly to the cap and with nothing else connected yet, then wait for a time until the cap charges, then disconnect that second resistor and connect the original circuit and it will be connected...
Explain why the actual resistance of the resistor is irrelevant. 1. Explain how you would expect charge to vary with potential and why? 2. Explain how you would expect charge to vary with capacitance and why? 3. Describe the relationship between capacitanc...