Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
What does the formula r' = r/n represent?
What does the formula r' = r/n represent?
The formula relates the internal resistance r of a cell to the total internal resistance r' when n cells are connected in series.
The total resistance of cells can be calculated using the formula R' = R + ______/n.
The total resistance of cells can be calculated using the formula R' = R + ______/n.
r'
Which of the following equations is part of Ohm's Law?
Which of the following equations is part of Ohm's Law?
- V = IR
- I = rac{V}{R}
- I = rac{E}{Rn + r}
- All of the above (correct)
For maximum current, R must be greater than zero.
For maximum current, R must be greater than zero.
Signup and view all the answers
What is the maximum current formula when R = 0?
What is the maximum current formula when R = 0?
Signup and view all the answers
Flashcards are hidden until you start studying
Study Notes
Key Concepts in Electrical Calculations
- Internal Resistance (r'): Calculated using the formula r' = r/n, where r is the internal resistance of a single cell and n is the number of cells.
Total Resistance of Cells
- Total Resistance Formula: Total resistance (R') in a circuit with multiple cells can be expressed as R' = R + (r'/n), where R is the external resistance.
- Alternative Expression: Total resistance can also be calculated with R' = (Rn + r)/n, allowing for easy computation based on total cells and internal resistance.
Ohm’s Law
- Fundamental Relationship: Ohm's Law states V = IR, where V is voltage, I is current, and R is resistance.
- Current Calculation: Current can be derived using I = V/R or I = E/R', with E being the electromotive force (emf) of the battery.
- Current in Terms of Resistance: Alternative form I = E/(Rn + r) shows how internal resistance affects current flow.
- Maximum Current Condition: For achieving maximum current in a circuit, the resistance (R) must be set to 0. This highlights the significance of minimizing resistance in electrical circuitry for optimal performance.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
