Current sensor and measurement device

A current sensor comprising:

• an annular magnetic core;
• a pair of windings including a first winding and a second winding, the first winding and the second winding each including a plurality of winding sections connected in series and wound around different portions of the magnetic core in a poloidal direction along a toroidal direction to detect a current flowing through a measurement target;
• a plurality of resistance elements, each resistance element connected in parallel to a respective winding section of the plurality of winding sections;
• a first return line with one end connected to one end of the first winding and the other end extending from the one end of the first winding to a position near the other end of the first winding along a toroidal direction of a portion of the magnetic core around which the first winding is wound;
• and
• a second return line with one end connected to one end of the second winding and the other end extending from the one end of the second winding to a position near the other end of the second winding along a toroidal direction of a portion of the magnetic core around which the second winding is wound, wherein
• the current sensor is configured to a signal indicating a difference between an output of the first winding and the first return line and an output of the second winding and the second return line.