Mechanism of common-mode noise and heat generation in an electric circuit with grounding using multiconductor transmission-line theory

The experimental measurements clearly show electromagnetic noise patterns in a three-line circuit, which represents a two-line circuit with grounding. A new three-line circuit theory reproduces the noise patterns of an electric circuit with grounding, allowing the origin of the noise of the three-line circuit to be understood. In addition, comparing the theoretical calculations of a three-line circuit to the experimental results reveals that electric power is converted to heat over time due to the resistance in the third line. The results demonstrate the importance of reducing the common-mode noise to avoid heat generation in an electric circuit.