5.0 Electricity Flashcards
(10 cards)
1
Q
Define electric current
A
The rate of flow of charge
2
Q
Define potential difference
A
The work done per unit charge
3
Q
A
4
Q
Define ohm’s law
A
Voltage is directly proportional to the current providing constant physical conditions
5
Q
Define resistivity
A
A measure of how strongly a material opposes the flow of electric current
6
Q
Define superconductivity
A
A property of a material where, below a certain temperature, the resistivity is zero
7
Q
Define terminal pd
A
The voltage across the terminals of the source when current flows
8
Q
Define internal resistance
A
Internal resistance is the resistance inside a power source that opposes the flow of current
9
Q
Direction of conventional current
A
Positive to negative
10
Q
Define emf
A
The work done by the battery on each coulomb of charge that passes through
