P3.2.3 - Resistance Flashcards
1
Q
What does current depend on?
A
Potential difference of the cell or battery
Resistance of the components
2
Q
What is resistance measured in?
A
Ohms
3
Q
How do you calculate current using p.d. and resistance?
A
Current (A) =
Potential Difference(V)
———————————-
Resistance (ohms)
4
Q
How is resistance produced?
A
Delocalised electrons collide with ions in the lattice.
5
Q
What is a variable resistor?
A
A circuit component that can be used to change the amount of wire or other resisting material
