Electronics & Virtual Labs

LED Circuit Challenge

Switch between schematic and physical wiring views, evaluate forward voltage drops across Red, Yellow, Green, Blue, and White LEDs, test polarity reversal, and inspect resistor comparison strips.

LED Circuit Challenge

Dual View

Master forward voltage drops, resistor sizing, and diode polarity with live calculations

LED operating in target educational range (8–22 mA)

* Approximate brightness visualization (educational conceptual glow)Calculated LED Current: 9.09 mA

1. Circuit Parameters

Supply Voltage (Vs):5.0 V

LED Type & Nominal Vf:

Series Resistor (R):330 Ω

2. Step-by-Step Live Math

1. Resistor Voltage Drop (VR):

VR = Vs − Vf

VR = 5.00V − 2.00V = 3.00 V

2. Estimated LED Current (I):

I = VR / R

I = 3.00V / 330 Ω

I = 9.09 mA

3. Resistor Power Dissipation (PR):

PR = I² × R

PR = 27.27 mW

3. Standard Value Comparison

In practical robotics, engineering involves choosing from readily available standard E12 resistor values:

220 Ω13.64 mA

Safe target operating current (Optimal)

330 Ω9.09 mA

Safe target operating current (Optimal)

470 Ω6.38 mA

Safe target operating current (Optimal)

Key Rule of Thumb: Standard 5mm indicator LEDs typically target 10 mA to 20 mA for crisp illumination without thermal stress.

Mathematical Formulation & Engineering Notes

V_resistor = V_supply − V_forward, I_led = (V_supply − V_forward) / R_series, P_resistor = I_led² · R_series.