How efficient is a cordless drill?
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From: jmfbahciv on 13 Aug 2010 08:53 Benj wrote: > On Aug 12, 8:40 am, jmfbahciv <See.ab...(a)aol.com> wrote: > >> I'm always surprised at the power they have. For some strange reason, >> I don't expect the battery to supply enough juice for all that power >> for a long time. >> >> But then, I never understood torque either. >> >> /BAH > > Well that is obvious. What you mean is you never understood all the > TORQUE they have. No. I never understood torque. I could solve the porblems, do the labs, but I nwever understood torque like I understood other mehcanical advantages. I think the not-understanding (at a gut level) had to with the geometry based on angles. >Torque is the amount of force applied to rotate the > bit. Power is the amount of energy supplied per a given time. You are > surprised that a drill can develop all that twisting ability, not > especially at how much energy per second (watts) are coming out of the > battery. In fact you are surprised that a so little power (watts) can > develop so much force (torque). The answer is based in a device called > a lever. I understand about the power to force. I am amazed that the batteries don't drain after one screwing especially if the material is not dry wall. /BAH |