Which of the following relation holds true regardless of circuit configuration or transistor type : [`I_E` - emitter current, `I_C`= collector current, `I_B` = base current]

Options

A. `I_E = I_C + I_B`
B. `I_E + I_C= I_B`
C. `I_C + I_B gt,I_E`
D. `I_C = I_B lt I_E`

Answer

To solve the question regarding the relationship between the emitter current (`I_E`), collector current (`I_C`), and base current (`I_B`) in a transistor, we can derive the relationship step by step.

### Step-by-Step Solution:

1. **Understanding Transistor Currents**:
- In a transistor, the currents are defined as follows:
- `I_E`: Emitter current
- `I_C`: Collector current
- `I_B`: Base current

2. **Current Flow in a Transistor**:
- The emitter current is the total current flowing out of the emitter terminal.
- The base current is the current flowing into the base terminal.
- The collector current is the current flowing out of the collector terminal.

3. **Applying Kirchhoff's Current Law (KCL)**:
- According to KCL, the sum of currents entering a junction must equal the sum of currents leaving that junction.
- For a transistor, this can be expressed as:
\[ I_E = I_C + I_B \]
- This equation states that the emitter current is equal to the sum of the collector current and the base current.

4. **Conclusion**:
- The relationship `I_E = I_C + I_B` holds true for all configurations of transistors (NPN or PNP) and is independent of the circuit configuration. This is a fundamental principle of transistor operation.

### Final Answer:
The relation that holds true regardless of circuit configuration or transistor type is:
\[ I_E = I_C + I_B \]