chapter 14: current of electricity Flashcards
1
Q
define electric current
A
rate of flow of charged particles
2
Q
define potential difference
A
electrical energy converted to other forms of energy per unit charge passing through the device
3
Q
define electromotive force
A
electrical energy converted from other forms of energy per unit charge transferred by the source in driving unit charge round a complete circuit
4
Q
define power
A
rate at which work is done
5
Q
define resistance
A
ratio of the potential difference across the conductor to the current flowing through it
6
Q
state the ohm’s law
A
the current through a metallic conductor is proportional to the potential difference across its ends under constant physical conditions
7
Q
define resistivity
A
measure of how strongly a material opposes electric current
