Discussion
Current sense resistor in a voltage regulator circuit is placed at :
Answer: C
The current sense resistor is placed in series with the emitter of the pass transistor.
In a series regulator, the whole load current flows through the pass transistor and out of its emitter to the load. A small resistor in that path develops a voltage proportional to the load current. When this voltage reaches about 0.6 to 0.7 V, it turns on a current-limit transistor that diverts base drive from the pass transistor, limiting the output current and protecting the circuit from overload or short circuit.
A resistor across the pass transistor or in parallel with the load would not carry the load current, and the collector side is the unregulated input, so the standard current-limiting arrangement senses at the emitter.
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