Acircuit has a voltage of 100v supplied from a power supply. an ammeter in the circuit gives a reading of 2a. what is the resistance in the circuit?

According to Ohm's law V=IR where V is the volts, I is the amps, and R is the resistance. We cam plug in the volts and the amps and solve for resistance for this question. 100=2*R This results in R=50 ohms. Hope this helps. :)

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -