In a class A amplifier with a sinusoidal input signal, the output current flows for full cycle i.e. 360° whereas, in a class B amplifier with a sinusoidal input signal, the output current flows for half cycle i.e. 180°.

The first workable prototype of the Internet came in the late 1960s with the creation of ARPANET, or the Advanced Research Projects Agency Network. Originally funded by the U.S. Department of Defense, ARPANET used packet switching to allow multiple computers to communicate on a single network.

It is due to the refraction of sunlight as it travels through Earth's atmosphere. ... Refraction of light by these layers can make the sun appear flattened or distorted. Objects closer to the horizon are raised upwards most and the lower limb of the Sun is raised more than the top making it appear oval.