In a light emitting diode (LED)

Options

A. negative leg is shorter than the positive
B. negative leg is longest than the positive
C. negative leg is equal to the positive leg
D. negative leg is zero and positive leg is infinite.

Answer

To determine the positive and negative legs of a light-emitting diode (LED), follow these steps:

### Step-by-Step Solution:

1. **Identify the Legs of the LED**:
- An LED has two legs: one longer and one shorter.

2. **Measure the Lengths**:
- Observe the lengths of the two legs. The longer leg is referred to as the anode, while the shorter leg is referred to as the cathode.

3. **Determine the Polarity**:
- The longer leg (anode) is the positive leg, and the shorter leg (cathode) is the negative leg.

4. **Evaluate the Options**:
- Given the options, you need to identify which statement correctly describes the relationship between the lengths of the legs:
- Option A: Negative leg is shorter than positive leg. (This is correct)
- Option B: Negative leg is longer than positive leg. (This is incorrect)
- Option C: Negative leg is equal to positive leg. (This is incorrect)
- Option D: Negative leg is zero and positive leg is infinite. (This is incorrect)

5. **Conclusion**:
- The correct answer is that the negative leg (cathode) is shorter than the positive leg (anode). Therefore, the correct option is A.