The formula to calculate Electromotive Force (ε) is:
\[ \epsilon = \frac{\epsilon' \cdot L}{l_2} \]
Where:
Electromotive Force is the energy that drives electric current around a circuit, measured in volts, and is responsible for maintaining the flow of electric charge.
EMF of Unknown Cell using Potentiometer is the voltage developed across the cell when it is connected to a potentiometer in a circuit.
Length is the distance between two points in a circuit, measured in meters, and is a fundamental parameter in electric current calculations.
Final Length is the total length of a wire or conductor in an electric circuit, including all its components and connections.
Let's assume the following values:
Using the formula:
\[ \epsilon = \frac{\epsilon' \cdot L}{l_2} \]
Evaluating:
\[ \epsilon = \frac{1.441 \cdot 1.5}{1.2} \]
The Electromotive Force is 1.8013 Volts.
| EMF of Unknown Cell (ε', Volts) | Length (L, Meters) | Final Length (l2, Meters) | Electromotive Force (ε, Volts) |
|---|---|---|---|
| 1 | 1 | 1 | 1.0000 |
| 1 | 1 | 1.2 | 0.8333 |
| 1 | 1 | 1.4 | 0.7143 |
| 1 | 1.5 | 1 | 1.5000 |
| 1 | 1.5 | 1.2 | 1.2500 |
| 1 | 1.5 | 1.4 | 1.0714 |
| 1 | 2 | 1 | 2.0000 |
| 1 | 2 | 1.2 | 1.6667 |
| 1 | 2 | 1.4 | 1.4286 |
| 1.2 | 1 | 1 | 1.2000 |
| 1.2 | 1 | 1.2 | 1.0000 |
| 1.2 | 1 | 1.4 | 0.8571 |
| 1.2 | 1.5 | 1 | 1.8000 |
| 1.2 | 1.5 | 1.2 | 1.5000 |
| 1.2 | 1.5 | 1.4 | 1.2857 |
| 1.2 | 2 | 1 | 2.4000 |
| 1.2 | 2 | 1.2 | 2.0000 |
| 1.2 | 2 | 1.4 | 1.7143 |
| 1.4 | 1 | 1 | 1.4000 |
| 1.4 | 1 | 1.2 | 1.1667 |
| 1.4 | 1 | 1.4 | 1.0000 |
| 1.4 | 1.5 | 1 | 2.1000 |
| 1.4 | 1.5 | 1.2 | 1.7500 |
| 1.4 | 1.5 | 1.4 | 1.5000 |
| 1.4 | 2 | 1 | 2.8000 |
| 1.4 | 2 | 1.2 | 2.3333 |
| 1.4 | 2 | 1.4 | 2.0000 |
| 1.6 | 1 | 1 | 1.6000 |
| 1.6 | 1 | 1.2 | 1.3333 |
| 1.6 | 1 | 1.4 | 1.1429 |
| 1.6 | 1.5 | 1 | 2.4000 |
| 1.6 | 1.5 | 1.2 | 2.0000 |
| 1.6 | 1.5 | 1.4 | 1.7143 |
| 1.6 | 2 | 1 | 3.2000 |
| 1.6 | 2 | 1.2 | 2.6667 |
| 1.6 | 2 | 1.4 | 2.2857 |
| 1.8 | 1 | 1 | 1.8000 |
| 1.8 | 1 | 1.2 | 1.5000 |
| 1.8 | 1 | 1.4 | 1.2857 |
| 1.8 | 1.5 | 1 | 2.7000 |
| 1.8 | 1.5 | 1.2 | 2.2500 |
| 1.8 | 1.5 | 1.4 | 1.9286 |
| 1.8 | 2 | 1 | 3.6000 |
| 1.8 | 2 | 1.2 | 3.0000 |
| 1.8 | 2 | 1.4 | 2.5714 |
| 2 | 1 | 1 | 2.0000 |
| 2 | 1 | 1.2 | 1.6667 |
| 2 | 1 | 1.4 | 1.4286 |
| 2 | 1.5 | 1 | 3.0000 |
| 2 | 1.5 | 1.2 | 2.5000 |
| 2 | 1.5 | 1.4 | 2.1429 |
| 2 | 2 | 1 | 4.0000 |
| 2 | 2 | 1.2 | 3.3333 |
| 2 | 2 | 1.4 | 2.8571 |