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If I have a 9v 200mAh battery. and I put a 10-Ohm resistor on it: 1.) does the current get divided by the 10: 200mAh / 10-Ohm = 20mAh :thinking: 2.) Does anything happen to the voltage? or does it stay at 9v? 3.) With does the 10k-Ohm resistor mean? I don't understand what the 'k'...

I'm building my first driver. I'm debating on using: 1 6v (lantern battery) 2 6v (lantern batteries) 12v adapter for an old land line phone. I would prefer the battery(s), but I don't know if that changes the Formula: 1.25 / .125mAh = 10ohm resistor Does the formula change if you use...

I bought these googles for my green lasers: Green Blue Laser Eye Protection Safety Glasses Goggles - eBay (item 270719787819 end time Apr-12-11 18:21:08 PDT) Really cheap (compared to what LPF-members were trying to get me to buy), and from what I can tell work Really, really well. I can 'just'...

However, I know nothing about bulbs, the perfect batteries, etc. I would prefer to get everything from radio shack since it's down the street. Can Someone help. What I have, but don't necessarily have to use: 1 mag light (takes D batteries x3) 4 rechargeable 6v batteries 200mAh (I think) 2...

I have 100mW 405nm, I'm trying to burn things (balloons mostly) at a range, but before I got get a lot of them I'm wondering what my laser would prefer to burn:thanks:

Playing with lasers in doors is fun... But out doors is where the fun is. However, I do live in a city and I have neighbors. I'm kind, so I don't shine near anyone's house. But if I ever have a run in with police for my 'over 5mW lasers' I want to have a plan. BTW if there is a better way...

Has anyone done it? It seems too good to be true. Half off the entire store for $7/month!!?!?!?!!!?!?! Just wondering if anyone had any input on the topic?

I wanna build a very simple red laser 'pointer' However, I don't know where to get diode, driver, module, or case. I'm also looking for tips. For a 'bottom of the line' laser pointer. < 1-5mW. This first laser is so I can get some hands on experience so I'll know what I'm doing in the future...