Yes Yes, I know for most (Grin if not ALL of you out there) this is a 100% trip Back to Basics, but I would rather be 100% FOR SURE than even 1% unsure. ( I don't like getting shocked ) And even though this will not give me a jolt, it is still a good practice for me to get into...

So here goes...

I am working on yet ANOTHER project, and on

http://ledcalc.com/#calc the basics go like this.

- Parallel - 9 vdc Power Supply

3.5 Voltage Drop

23 milliamps

6 LED's (Blue)

Then the numbers come up as:

39.86 ohms 47 ohm - Nearest 1 watt - recommended for Resistor

19.5 is actual Power Dissipated by LED - 68 mw Power Dissipated by Resistor - 644 mw

Then Circuit's current consumption = 117 ma

For this 6 Blue LED setup as I have it, I initially set it up on the breadboard with 1/8 or 1/4 watt 35 ohm resistor (I did this because I started out with a Voltage drop of 3.7 (so they would be brighter) and a 25 milliamp also so they could be brighter, I was not sure which one controlled it so I tried to cover both bases, was this right ??? )

Anyway, I used a 1/8th or 1/4th watt resistor and of course it started getting warm REAL QUICK, and then it got to the point of being HOT to the touch.

Now for my 2nd question... (Grin) And this is more important to me than the first one above...

- Can I use 4 - 1/4 watt resistors to "make" a 1 watt resistor, and the same goes for 2 - 1/2 watt resistors?

- If I can, do I put them in series?

I am asking this because I NEED to get this done to make sure that the resistors will be "OK" if I accidentally touch them. I have called the local Rat Shack and of course NONE of the 11 I have close me has a 1 watt 47 ohm resistor.

Dan