Recent content by DruidArmy

These are great responses. But as far as going back to moon, how about sending unmanned craft such as lunar rovers and other electronic equipment to keep costs to a minimum.

How much does it cost? How much does any country have to spend? I doubt , anyone of us can answer these questions?

We - means Earthlings.

Not sure I got a good answer as to why no one has returned to the moon. There are many scientific reasons to return. Real scientists would have hundreds, thousands of things they could do there. Funding? Who knows, but this is not a good reason, if we can afford to go to mars, we can...

We could build telescopes, radar, place radio reflectors, mine, set up self sustaining biospheres, etc, etc, etc. on the moon. Big waste of time and big money just to find a microbe on mars.

Why haven't we gone back to the moon? Seems like we could save a whole lot of money and time if we were to go back and explore the moon rather than going to mars. A lot of the questions posted here could be answered if we had gone back. Why aren't you asking this question yourself?

Thanks for the lecture link. I've watched the whole MIT series before on physics with that funny professor who has now retired. Very good lectures. I liked it when he levitated a blow up doll using a simple winding and 110v house current, using induced eddy currents. On his final lecture he...

Okay, I see that the resistors are using all the power in that circuit. I didn't realize resistors used up that much power. It makes me wonder if you plug a radio or any other device into a 110v A/C wall socket, does it use all the power delivered to it? I was thinking that if you had...

I don't really know if the resistor is using 9 amps of power. It is resisting the flow of electrons, so that only 1 amp is flowing. The other 9 amps are not actually being sent out of the battery. So there is no way its wasting 9 amps. So I don't really know how much power it is using.

I believe Ohms is I=V/R, so 1 amp will show for both meters since they are serially arranged. Power(watts)= 10 watts. Now how much power is used by the resistor, hmm... Let's see, if the resistor was not there then 10 amps would be flowing assuming no resistance. Since only 1 amp is flowing...

Okay, you have convinced me that I better work with 12v DC instead of 120v AC for safety reasons. I think the book recommended looks good - Of course it had to be a $110 dollar book :) I will verify that my bulb uses 100% of the power sent to it - I still think much of the current passes...

I may have confused the issue by mentioning resonance. I guess it is not necessary to be at resonance for this. Let me restate: Assume simple battery connected to 12 volt light bulb. The current flows thru the light bulb and the bulb dissipates some of the energy as light and heat. However...

Yes, the kits include a breadboard. But mostly they are just putting pieces into place, with very little in the way of explaining in detail what is happening in the circuit. For example, say I want to experiment with electrolysis, so I want to plug into a 120v AC main, then be able to change...

I've got the Elenco 150 in one kit, I've done a radio kit, buzzer, etc. I got my Ham license and went thru all that training. I've read the ham radio handbook. It was way too technical for my level. All the books I can find that are introductory just explain what a capacitor is, what...

I have done several kits, but most are really weak when explaining "Theory of Operation". It's the why we put a capacitor here, why is a diode there, here's what's happening as the electrons flow around the circuit kind of stuff that I need more of. It amazes me how ham operators,many of whom...