Answer:
Flashlight
Step-by-step explanation:
There are two types of electric current i.e. direct current and alternating current.
Out of given options flashlight uses direct current because it works with the help of batteries. Batteries are used to store electrical energy. One of the example of DC power is a battery. In DC current, the current flows only in one direction. It do not changes its direction.
So, the correct option is (b) "flashlight".