The advantage of using current-based sensing devices is:

• A. It is less susceptible to noise
• B. It is cheaper to produce
• C. It consumes less power
• D. It has higher resistance

Answer: (A)

Current-based sensing shines when it comes to noise immunity because the signal is carried by the current in a loop rather than by voltage on a wire. In industrial settings, using a current loop (like 4-20 mA) keeps the signal robust over long distances and through wiring resistance changes or EMI. As long as the loop current stays within spec, voltage spikes or noise on the supply line have less effect on the measurement, so the reading remains accurate. The other options aren’t inherent advantages of current-based sensing: higher resistance would actually introduce more voltage drop and noise susceptibility; cheaper production and lower power consumption depend on implementation and aren’t guaranteed benefits of this sensing method.