Current Flashcards
define current
rate of flow of charge
define e.m.f
the energy transferred from non-electrical forms to electrical forms, per unit charge in driving a unit charge round a complete circuit
define potential differnece
the energy transferred from electrical forms to non-electrical forms, per unit charge when a unit charge passes from one point to the other
Does e.m.f and p.d exists regardless of current flowing in the circuit, and explain
e.m.f yes as it exists as a property of energy source, p.d no, only if current is flowing in circuit, as it represents energy transfer due to motion of charge carriers
define power
rate of flow of energy transfer
flow of electric charge in DC vs AC
one direction only vs periodically reverse direction
define period
time taken for an a.c. to repeat itself
define frequency
number of repetitions of the a.c. per unit time
define peak value current
maximum value of the a.c.
define root mean squared value
the value of the steady direct current (or voltage) that dissipates heat energy in a resistor at the same average rate as that is dissipated by the alternating current (or voltage)
