jäännösvirta
Jäännösvirta, also known as residual current, is the difference between the current flowing into an electrical circuit and the current flowing out of it. In a normal, healthy circuit, these two currents should be equal. The difference arises when current flows through an unintended path, such as through a person touching a faulty appliance or through a damaged cable.
This difference in current is precisely what residual current devices (RCDs), also known as Ground Fault Circuit
Jäännösvirta is a critical concept in electrical safety. Its presence indicates a fault condition that needs