Current of Electricity Flashcards
definition of electric current
rate of flow of charged particles (direction of current is same as net charge flow, opp to -ve charge)
ampere
eqn for electric current
I = Q/t
i am a qt
def of electric charge
the charge which flows past a point in time t is the product of current and time, if current is steady
coulomb
def of electric potential difference
the pd across a device is the electrical energy converted to other forms of energy per unit charge passing through the device
volt
eqn for pd
v = w/Q
where w is amt of energy converted from electric TO other forms (J)
def of electromotive force
the em force of a source is the electrical energy converted FROM source in driving unit charge around a complete circuit
eqn for em force
E = w/Q
where w is amt of energy from electric to other forms (J)
def for electric power
power is the rate at which work is done
watt
eqn for electric power
P = W/t = IV = IE
def of resistance
the ratio of the potential difference across the conductor to the current flowing through it
ohms law
the current through a metallic conductor is prop to the PD across its ends under constant physical conditions
