ryanmarr27 ryanmarr27

22-10-2019
Engineering

contestada

A circuit includes a 12 VDC power supply which powers a blue high-intensity LED with a forward voltage of 4.5volts. The LED is rated to withstand a maximum current of 20mA. What size resistor should be connected in a series with the LED?

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MathPhys MathPhys

22-10-2019

Answer:

375 Ω

Explanation:

Sum of voltage gains = sum of voltage drops

12 V = 4.5 V + (0.020 A) R

R = 375 Ω

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