Exam Question
(a) Name the factors the resistance of a conductor depends on? (4)
(b) Describe three types of Resistive strain gauge. (6)
(c) Explain the working of a strain gauge used for pressure measurement. (6)
Class 4 (4th Engineer)
MET
📅 Oct 2023
Reference Answer
### (a) Factors Affecting the Resistance of a Conductor (4 Marks)
The electrical resistance (R) of a conductor is determined by four fundamental factors. An understanding of these is critical for electrical circuit design and material selection.
1. **Length of the Conductor (L):** Resistance is directly proportional to the length of the conductor. As the length increases, the path for the electrons to flow becomes longer, leading to more collisions with the atoms of the material, thus increasing the opposition to current flow.
* **Relationship:** $$ R \propto L $$
The electrical resistance (R) of a conductor is determined by four fundamental factors. An understanding of these is critical for electrical circuit design and material selection.
1. **Length of the Conductor (L):** Resistance is directly proportional to the length of the conductor. As the length increases, the path for the electrons to flow becomes longer, leading to more collisions with the atoms of the material, thus increasing the opposition to current flow.
* **Relationship:** $$ R \propto L $$
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