Physics

In a filament type light bulb most of the electric power consumed appears as Infra-red rays. When electricity flows through the fiber, it heats up. Depending on the filament temperature, the radiation is emitted from the filament.

Lightning is produced when strong opposite charges in different clouds break down the resistance offered by the intervening air.

Atomic hydrogen is unstable and it has life period of a fraction of a second.

Total work done in lifting and moving the luggage is 588 Joules._x000D_ Explanation :_x000D_ 1. work done in lifting the luggage_x000D_ = potential energy of the luggage_x000D_ = mgh_x000D_ where,_x000D_ m = mass = 20 kg_x000D_ g = acceleration due to gravity = 9.8 m/s²_x000D_ h = height = 3 m_x000D_ Hence,_x000D_ P = mgh = 20 x 9.8 x 3_x000D_ = 588 J_x000D_ 2. work done in moving the object,_x000D_ Since now weight of the luggage is acting in downward direction and the movement is in horizontal direction, hence work done in moving the luggage is zero because component of force along horizontal direction is zero._x000D_ Total work done = 588 + 0 = 588 J._x000D_ Hence total work done in lifting and moving the luggage 588 J.

The earth-wire of a cable is connected to the fuse of the appliance.

When velocity is halved, its kinetic energy becomes 1/4th.

A thermocouple consists of two dissimilar metals, joined together at one end. When the junction of the two metals is cooled or heated a voltage is produced that can be correlated back to the temperature. Most thermocouple alloys are commonly available as wire.

The choke primarily serves to limit current flow to the correct level for the tube. It also can be used during startup to provide an inductive ‘kick’ forming a momentary higher-voltage pulse to start the lamp.

Capillary action is the result of adhesion and surface tension. Adhesion of water to the walls of a vessel will cause an upward force on the liquid at the edges and result in a meniscus which turns upward. The surface tension acts to hold the surface intact, so instead of just the edges moving upward, the whole liquid surface is dragged upward.