Ohm's law fails in
Ohm's law fails in
A
Diode
B
transistor
C
PN junction system
D
All of these
Text Solution
AI Generated Solution
The correct Answer is:
**Step-by-Step Solution:**
1. **Understanding Ohm's Law:**
Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points, provided the temperature remains constant. Mathematically, it is expressed as:
\[
V = I \cdot R
\]
where R is the resistance.
2. **Identifying Conditions for Ohm's Law:**
Ohm's Law is applicable under certain conditions, specifically in ohmic materials where the relationship between voltage and current is linear. This means that if you plot a graph of voltage (V) versus current (I), you should get a straight line.
3. **Analyzing Non-Ohmic Components:**
Components like diodes and transistors do not follow Ohm's Law. For example, in a diode, the current does not increase linearly with voltage. Instead, there is a threshold voltage (forward bias) that must be exceeded for current to flow significantly. Below this threshold, the current is very low.
4. **Graphical Representation:**
For a diode, if we plot the current (I) against the voltage (V), we get a curve rather than a straight line. This indicates that the relationship between voltage and current is not linear, which is a key characteristic of non-ohmic devices.
5. **Conclusion:**
Ohm's Law fails in devices such as diodes and transistors because their current-voltage characteristics are non-linear. Therefore, the correct answer to the question "Ohm's law fails in" is that it fails in diodes and transistors.
**Final Answer:**
Ohm's law fails in diodes and transistors.
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