Electric Circuits P1 Flashcards
1
Q
State ohm’s law
A
- current through a conductor is directly proportional to the potential difference across it
- as long as temperature remains constant
2
Q
What is an ohmic conductor
A
When current is directly proportional to the potential difference across a conductor, at a constant temperature
3
Q
Two features of the graph for an ohmic conductor
A
- straight line (directly proportional)
- through the origin
4
Q
What is a non-ohmic conductor
A
When current is NOT directly proportional to the potential difference across a conductor, at a constant temperature
5
Q
what is the equation for total resistance in a series circuit
A
rt = r1 + r2 + r3
6
Q
what is the equation for total resistance in a parallel circuit
A
1/rt = 1/r1 + 1/r2 + 1/r3
7
Q
what is the definition of emf
A
The energy given by the source (usually a battery / cell) to a charge carrier
