4.33 We wish to operate three red LEDs in series as shown in Fig. E4.33 under a 9-V supply. They each have a rated forward voltage drop of 1.8 V at 20 mA. What value resistor, R, is required to sustain 20 mA?
4.33 We wish to operate three red LEDs in series as shown in Fig. E4.33 under a 9-V supply. They each have a rated forward voltage drop of 1.8 V at 20 mA. What value resistor, R, is required to sustain 20 mA?
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