13.4 More circuit calculations Flashcards

1
Q

Cell current =

A

Cell emf / total circuit resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Pd across each resistor in series with the cell =

A

Current x the resistance of each resistor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Pd across the parallel combination =

A

Current through each resistor x resistor’s resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

If the cells are connected in the same direction in the circuit, the net emf is…

A

…the sum of the individual emfs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

If the cells are connected in opposite directions to each other in the circuit, the net emf is…

A

…the difference between the emfs in each direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The total internal resistance is the…

A

…sum of the individual internal resistances. This is because the cells, and therefore the internal resistances are in series

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

For a circuit with n identical cells in parallel, the current through each cell =

A

I/n

In which:
I is the total current supplied by the cells
r is the internal resistance of each cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Each time an electron passes through the cells, it travels through one of the cells only (as the cells are in parallel), therefore, the cells act as a source of emf ε and internal resistance r/n.

A

Electron
emf
Internal resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A diode that is reverse-biased has ______ resistance

A

Infinite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are Kirchhoff’s laws

A

At any junction in a circuit, the total current entering the junction is equal to the total current leaving the junction

For any complete loop in a circuit, the sum of the emfs around the loop is equal to the sum of the potential drops around the loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly