High electrical resistance refers to the difficulty that electric current encounters when flowing through a component or connection in a system. This issue can arise due to lose connections, damaged wires, or corroded connections. High electrical resistance can lead to an increase in temperature at the problematic point, which in turn can result in premature component deterioration, system malfunctions, and even fire hazards. Infrared thermography is a crucial tool for detecting this type of failure, as it can identify areas with abnormally high temperatures in electrical systems. This allows technicians to identify and address issues before they cause serious damage or hazardous situations.