13.4- MORE CIRCUIT CALCULATIONS Flashcards
1
Q
If cells are connected in the same direction in a circuit, what is the net emf?
A
sum of individuals emfs
2
Q
If cells are connected in opposite directions in a circuit, what is the net emf?
A
difference between emfs in each direction
3
Q
What is the total internal resistance the sum of?
A
individual internal resistances
4
Q
Why is the total internal resistance the sum of individual internal resistances?
A
as the cells, and so internal resistances are in series
5
Q
In a circuit with one or more diodes, what p.d. exists across a diode that’s forward-biased + passing a current?
A
0.6V
6
Q
What resistance does a diode that’s reverse-biased have?
A
infinite resistance
