Answer:
Electromagnetic induction
Step-by-step explanation:
It is a process in which current is produced in a metallic conductor when it is moved through a magnetic field.
To better understand the process we can take the example of a fan and the air present in our rooms. The air is always present and available in room but we can never feel its presence unless we turn the fan on. Similarly, electrons are always present in a wire or conductor, but when we produce magnetic field around it, it produces current. This is basically Electromagnetism of electro-magnetic current induction. So, we can say that it is a process in which current is produced without giving the support of a battery.
Hope it helps!