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13 Cards in this Set
- Front
- Back
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charge
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charge = current * time
Q = It |
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coulomb
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one coulomb is the total charge supplied by a current of 1 ampere in a time of one second
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kirchhoff's first law
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the sum of the currents entering any junction is always equal to the sum of the currents leaving the junction
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kirchhoff's second law
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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
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electromotive force
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the energy transferred per unit charge when one other type of energy is converted into electrical energy
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potential difference
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electrical energy transferred per unit charge when electrical energy is converted into another form of energy
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ohm's law
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states that the current through a conductor is proportional to the potential difference across it, provided physical conditions such as temperature, remain constant
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resistivity
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the resistivity ρ of a wire of length l, resistance R and cross-sectional area A is given by ρ = RA/l
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kilowatt-hour
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1000 watts for 3600 seconds. it is therefore 3,600,000 J
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nodes
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points in a stationary wave at which there is no displacement of the particles at any time
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antinodes
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the displacement of the particles in a stationary wave varies by the maximum amount
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one electronvolt (eV)
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the energy an electron with charge 1.6x10^-19C acquires when it rises through a potential difference of 1 volt
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threshold frequency
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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
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