Questions and Answers
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.
r'
Which of the following equations is part of Ohm's Law?
For maximum current, R must be greater than zero.
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What is the maximum current formula when R = 0?
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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.
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Description
This quiz covers important concepts from the chapter on electrical circuits related to resistance, Ohm's Law, and current calculations. It includes formulas for total resistance of cells and conditions for maximum current flow. Test your understanding of these key electrical principles!
