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13 Cards in this Set

  • Front
  • Back
charge = current * time
Q = It
one coulomb is the total charge supplied by a current of 1 ampere in a time of one second
kirchhoff's first law
the sum of the currents entering any junction is always equal to the sum of the currents leaving the junction
kirchhoff's second law
states that in any closed loop in a circuit the sum of the em.f.s is equal to the sum of the p.d.s
electromotive force
the energy transferred per unit charge when one other type of energy is converted into electrical energy
potential difference
electrical energy transferred per unit charge when electrical energy is converted into another form of energy
ohm's law
states that the current through a conductor is proportional to the potential difference across it, provided physical conditions such as temperature, remain constant
the resistivity ρ of a wire of length l, resistance R and cross-sectional area A is given by ρ = RA/l
1000 watts for 3600 seconds. it is therefore 3,600,000 J
points in a stationary wave at which there is no displacement of the particles at any time
the displacement of the particles in a stationary wave varies by the maximum amount
one electronvolt (eV)
the energy an electron with charge 1.6x10^-19C acquires when it rises through a potential difference of 1 volt
threshold frequency
the lowest frequency of radiation that will result in the emission of electrons from a particular metal surface. for most metals this frequency occurs in the UV region of the EM spectrum