<p>Concave and convex are two classes of spherical mirrors. A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. On the...

Concave and convex are two basic types of lenses. A convex lens focuses light rays, whereas a concave lens causes the light rays to diverge.

Capacitor is a device that is used to store an electric charge. It stores a charge in the form of an electrostatic field. An ultracapacitor is also known as a supercapacitor or double-layer capacitor. An...

A diode is a type of electrical device that allows current to move through it in only one direction. It consists of an N-type semiconductor and a P-type semiconductor that are placed together. A capacitor...

Battery is a device that consists of electrochemical cells that convert stored chemical energy into electrical energy. Rechargeable batteries are also known as secondary batteries. These batteries are capable...