electricity Flashcards
what is energy
work done by a force of one newton when it moves one metre in the direction of action of the force
what is frequency
one oscillation per second
what is current
when 1 coulomb of charge flow past a point in one second
what is potential difference
when 1 joule of energy is transferred to ( or form ) 1 coulomb of charge
what is power
when 1 joule of energy is transferred in 1 second
what is charge
1 coulomb is the amount of charge delivered by 1 ampere of current in 1 second
what is resistance
transmits a current of one ampere when subjected to a potential difference of 1 volt
what is resistivity
resistance of unit length of wire with unit cross sectional area
what is the voltage called that starts a diode
trigger voltage
what does a diode on a graph look like
follows the line of the x axis until the trigger voltage which causes a gradual gradient
what is Kirchhoff’s first law
total current into a junction = total current out of a junction
what is EMF
electromotive force
how many electrons are required to carry 1 coulomb of charge
no. of electrons = 1C/1.6x10^-19C = 6.25x10^18
what is the equation for volts
energy transferred / charge
what are the 2 types of circuits
-series
-parallel
