A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.
A sense resistor is a low-value, high-precision resistor specifically designed for current sensing applications. It is placed in series with a load to measure current by detecting the voltage drop across it according to Ohm's Law (V = I × R). These resistors feature extremely low temperature coefficients, minimal inductance, and tight tolerance to ensure accurate current measurement in power management, motor control, battery monitoring, and overcurrent protection circuits.
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Sense resistors have much lower resistance values (milliohms), tighter tolerances, lower temperature coefficients, and minimized parasitic inductance compared to standard resistors, making them suitable for accurate current measurement.
Current (I) = Voltage drop (V) / Resistance (R). Measure the voltage across the sense resistor terminals and divide by its known resistance value.
They provide real-time current measurement, allowing the control circuit to detect overcurrent conditions and trigger protective actions like reducing power or shutting down the circuit.
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