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electricity and magnetism
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Gravity
Terms in this set (26)
electric field strength
the force per unit positive charge on a small test charge placed at that point
direction of an electric field
the direction of the force on a small positive test charge would point if placed in the field (+ to -)
electric potential difference
difference in electric potential energy per unit charge between two locations
electronvolt
energy gained by an electron moving through an electric potential difference of one volt. (OR: Work done moving an electron through an electric potential difference of one volt.)
electric current
flow rate of charge, measured relative to force per unit length between parallel current-carrying conductors
resistivity
"RA/L
resistance
ratio of potential difference applied to a device to the current through the device
Ohm's Law
the voltage across a conductor is directly proportional to the current at constant temperetaure (for Ohmic conductors)
electromotive force (emf)
work done per unit charge in moving charge completely round the circuit.
electromotive force (emf)
energy per unit charge made available by the source.
electromotive force (emf)
terminal potential difference when no current is supplied."
electromotive force (emf)
energy supplied by source per unit charge when charge is flowing around a circuit."
Internal resistance
the electrical resistance of the materials a cell is made of.
primary cells
cells which cannot be recharged
secondary cells
cells which can be recharged
drift speed
the slow speed at which ions move along a conductor
conductor
a material which contains free charges/ions
potential dividers
circuit elements (sometimes sensors) to produce variable potential differences
thermistor
high temperature = less resistance
LDR
bright light = less resistance
ammeter
device which measures electric current (ideally zero resistance, connected in series)
voltmeter
device which measures potential difference ((ideally infinite resistance, connected in parallel)
Kirchhoff's junction rule
conservation of charge, the sum of all currents (or total charge) entering a junction equals the sum of all currents (or total charge) leaving the junction
Kirchhoff's loop rule
conservation of energy, the sum of all variations of potential difference in a closed loop is zero
magnitude of a magnetic field
size or magnetic force on a current carrying conductor divided by the product of the current, length of wire and sine of the angle between the current and the magnetic field
direction of a magnetic field
the direction that the North pole of a small test compass would point if placed in the field (N to S)
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