physics practice exam 2

what is orbital electron agnular momentum?

orbital motion of electron around nucleus

what is electron spin?

intrinsic angular momentum of electron

what is the stern-gerlach experiment?

splitting of atoms in two directions through a magnetic field showing quantized spin

what causes magnetism?

electron motion and spin

what is a magnetic domain?

region where magnetic moments align

what is a magnetic field?

region where magnetic forces act

what is magnetic force?

force on moving charges in magnetic field

what is an electromagnet?

magnet created by electric current

define faraday’s law

changing magnetic field induces voltage

define maxwell’s counterpart to faraday’s law (ampere’s law)

a moving charge creates a magnetic field

what is an electric motor?

converts electrical to mechanical energy

what is an electric generator?

converts mechanical to electrical energy

what is a transformer?

changes voltage levels

what is a circuit?

closed loop for current

define potential difference

work done to a move a charge

define ohm’s law

V=IR

what is a series circuit?

single path

what is a parallel circuit?

multiple paths

what is DC?

one-direction current

what is AC?

alternating current

what is a diode?

allows current one way

what is a resistor?

opposes current

resistance in series?

add directly

resistance in parallel?

inverse add

define watts

power