Electricity Flashcards
(8 cards)
0
Q
What is potential difference?
A
Potential difference
1
Q
What is current?
A
Rate of flow of charge
2
Q
What is emf?
A
The electrical energy produced per unit charge passing through the source
3
Q
What is ohms law?
A
That the potential difference across a metallic conductor is proportional to the current flowing through it
4
Q
What is the unit of resistivity?
A
Ohm meters
5
Q
What is a superconductor?
A
It is a wire of device that has zero resistivity at and below a critical temperature which depends on the material
6
Q
What is internal resistance?
A
The loss of pd per unit current in the source when current passes though the source
7
Q
What is the RMS?
A
The value of direct current that would give the same heating effect as the ac current in the same resistor
