A microampere (µA) is a unit of electric current equal to one-millionth of an ampere. It is commonly used in electronics to measure very small currents, such as those found in sensitive devices like sensors and medical equipment. The symbol for microampere is µA, where "micro" denotes the factor of one-millionth. Microamperes are important in various applications, including medical devices like heart monitors and environmental sensors that detect minute changes in conditions. Understanding microamperes helps engineers and technicians design circuits that operate efficiently without consuming excessive power.