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how to make a circuit using 4 lED's, 9volts battery, and resistor? Answered

how to make a circuit using 4 lED's, 9volts battery, and resistor? what kind of resistor should I use?

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mpilchfamily

3 years ago

IED? Don't get many people asking about Improvised Explosive Devices being used in a cricuit. LOL

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iceng

3 years ago

OK two identical circuits in parallel ...

White LED forward drop 3.5V @ 20ma ..

Each is two leds in series a 100 ohm 1/4 watt resistor.

The math is ; two LEDs in series are 3.5v + 3.5v = 7volts

Leaving 9vBattery - 7.0vLEDs = 2volts for resistor

Ohms Law R = V / i = 2 / o.02 = 100 ohms

Ohms Law P = V x i = 2 x o.02 = o.04 watts ... Closest available is 1/4w.

LED4-9V.bmpLED4b-9V.bmp
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icengiceng

Answer 3 years ago

BTW all circuits work the same ....

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iceng

3 years ago

4red or 4white ?

You got to Decide first, then tell us !!!!