Jinsi ya kukokotoa L E D Resistor
L E D Resistor ni nini?
Calculates resistor value needed to limit current through an LED to safe operating levels. Prevents LED burnout and extends lifespan.
Fomula
Formula: R = (V - Vf) ÷ I
- R
- (V - Vf) ÷ I — (V - Vf) ÷ I
- V
- V value — Variable used in the calculation
- Vf
- Vf value — Variable used in the calculation
- I
- I value — Variable used in the calculation
Mwongozo wa Hatua kwa Hatua
- 1Supply voltage (V)
- 2LED forward voltage (typically 1.5-3.5V)
- 3Desired LED current (typically 2-20mA)
- 4Formula: R = (V - Vf) ÷ I
- 5Select nearest standard resistor value
Mifano Iliyotatuliwa
Ingizo
LED 2V, supply 5V, 20mA
Matokeo
150ohm resistor
Makosa ya Kawaida ya Kuepuka
- ✕Using incorrect LED forward voltage for color
- ✕Not accounting for voltage supply variation
Maswali yanayoulizwa mara kwa mara
What happens without current limiting resistor?
LED draws maximum current, burns out immediately, and can damage power supply.
How do I select resistor wattage?
Power = V × I; select resistor rated 2× calculated power for safety margin.
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