Recent content by RFMatt

What I meant by the charge (+ or -) not having significance is that, from your frame of reference getting shocked, the direction of electron transfer is imperceptible. That is, whether the electron transfer is from you to the metal (in the case of a positive charge) or the metal to you...

Give your cast iron more time to heat up before using it, it takes a looong time to charge a full cast iron skillet. I use cast iron on an induction burner and it certainly gets hot in a hurry, but takes a while (maybe 10-15 minutes) to even out.

I don't believe (someone correct if I'm wrong) the charge of your hand really matters, as long as sufficient potential exists between you and the conductive thing you're touching, you will receive a static shock.

That's a little farther than my understanding, but as a SWAG I imagine is has to do with the size of the atoms vs the wavelength of the light.

The metal block, while not grounded, is still at a lower potential to your now charged up hand. The static charge equalizes these potentials (which is why it won't shock you twice in a row). Remember that voltage is relative to the two things being measured.

Perhaps because you are avoiding mind altering drugs? :-) Different elements absorb/reflect different wavelengths of light (Google: spectral graph), so, assuming the composition of that apple is the same every time, then the colors reflected will be the same. So I guess the answer is, yes...

Different receptor cells in your eyes react with different wavelengths of light. What you perceive as color is your brains interpretation of these signals. Interesting to think that what I perceive as red may look nothing like what you perceive as red :-)

Almost all of the extra range comes from the different frequencies, the 2.4GHz band that 802.11g operates in attenuates significantly less than the 5GHz band that 802.11a operates in. As frequency increases (wavelength decreases) the ability to penetrate objects goes down (generally, some...

Surprised to see nobody post about back-voltage on the DC motor. Remember any electric motor is also a generator, as the speed increases so does voltage it generates (in opposition to the voltage you are using to drive it). DC motors have max torque at zero because there is no opposite voltage...