Resistance Flashcards
0
Q
What are the units for:
A) resistance
B) potential difference
C) current
A
A) ohms
B) volts
C) amperes
1
Q
What is the equation for calculating resistance?
A
Resistance = (potential difference)/(current)
2
Q
State ohms law.
A
Provided the temperature is constant, the current through an ohmic conductor is directly proportional to the potential difference across it.
3
Q
What is an ohmic conductor?
A
Conductors that obey ohms law. These are mostly metals.
4
Q
What does a graph of potential difference plotted against current for an ohmic conductor look like?
A
A straight line graph starting at the origin.
5
Q
When does a conductor not obey ohms law?
A
When the temperature does not remain constant.
