Electromotive force represents

Options

A. force
B. energy
C. energy per unit charge
D. current

Explanation

To solve the question "Electromotive force represents", we need to understand the concept of electromotive force (EMF) and its relation to energy and charge.

### Step-by-Step Solution:

1. **Understanding Electromotive Force (EMF)**:
- Electromotive force (EMF) is a term used to describe the voltage generated by a source such as a battery or generator when no current is flowing.
- It is essentially the energy provided per unit charge by the source.

2. **Formula for EMF**:
- The relationship between work done (W), charge (Q), and potential difference (V) is given by the formula:
\[ V = \frac{W}{Q} \]
- Here, \( V \) is the potential difference (or EMF), \( W \) is the work done in moving the charge, and \( Q \) is the amount of charge.

3. **Interpreting the Formula**:
- Rearranging the formula gives:
\[ W = V \times Q \]
- This indicates that the work done in moving a charge \( Q \) through a potential difference \( V \) is equal to the EMF multiplied by the charge.

4. **Understanding the Concept of Energy per Unit Charge**:
- Since EMF represents the work done per unit charge, we can express it as:
\[ EMF = \frac{W}{Q} \]
- This means that electromotive force is essentially the energy provided (work done) to move a unit charge from one point to another.

5. **Conclusion**:
- Therefore, electromotive force represents energy per unit charge. This leads us to conclude that the correct answer to the question is option 3: "energy per unit".

### Final Answer:
Electromotive force represents **energy per unit charge**.

---