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f-alpha.net » Electronics » Optoelectronics » Light-Emitting Diode (LED) » Let's go... » Experiment 6 - Series Circuit II

Experiment 6 - LEDs in a Series Circuit II

A typical red light-emitting diode has a minimum forward voltage of approximately 1.75 volts. Below this voltage no current flows through the LED. Eine typische rote Leuchtdiode hat eine

As a result, you can accommodate a maximum of five LEDs in a series circuit. In that case, each LED stands 1.8 volts. This is enough for a weak forward current and a faint glow. You can even do without the current-limiting resistor.

Series circuit of six LEDs. (Enlarge)

If you connect six LEDs in a series circuit, each LED stands only 1.5 volts, below the minimum forward voltage. All LEDs remain dark.

Circuit diagram of six LEDs in series.

The next experiment shows you how you can still connect six LEDs.

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