Which of the following factors will not affect the degree of ionisation ?

Options

A. Temperature
B. Concentration
C. Type of solvent
D. Current

Explanation

To determine which factor will not affect the degree of ionization, we need to analyze each of the provided options: temperature, concentration, type of solvent, and current.

### Step-by-Step Solution:

1. **Understanding Degree of Ionization**:
- The degree of ionization refers to the extent to which a substance (typically an electrolyte) dissociates into ions in a solution. This can be influenced by various factors.

2. **Effect of Temperature**:
- Increasing the temperature generally increases the degree of ionization. This is because higher temperatures provide more energy to the molecules, allowing them to overcome the forces holding them together and thus dissociate into ions more readily.

3. **Effect of Concentration**:
- The degree of ionization is inversely related to concentration for weak electrolytes. As the concentration of a weak electrolyte increases, the degree of ionization decreases. Conversely, diluting a solution increases the degree of ionization.

4. **Effect of Type of Solvent**:
- The type of solvent can significantly affect the degree of ionization. Strong electrolytes tend to ionize completely in polar solvents, while weak electrolytes do not. Therefore, the solvent's properties can influence how readily a substance ionizes.

5. **Effect of Current**:
- Current is a result of the movement of ions in a solution. However, the amount of current does not affect the degree of ionization itself. The degree of ionization is determined by the nature of the electrolyte and the conditions of the solution, not by the current flowing through it.

### Conclusion:
Based on the analysis, the factor that will **not** affect the degree of ionization is **current**. Therefore, the correct answer is:

**Current will not affect the degree of ionization.**