Explanation

KVA (Kilovolt-Ampere) is used to express the apparent power capacity of an electrical generator or transformer.

It representing the total power without considering the power factor.

It combines both real power (in KW) and reactive power (in KVAR).

Explanation

• Air expands the most for a given rise in temperature, due to its low density and high thermal expansion coefficient.
• This is why hot air rises and cool air sinks, driving convection currents in the atmosphere.

Explanation

• Refrigerators work on the principle of heat transfer through conduction, convection, and radiation.
• They use a combination of these methods to transfer heat from the inside to the outside, keeping your food and drinks cool and fresh.

Explanation

• The Earth's atmosphere absorbs blue light to a lesser extent and reflects other wavelengths.
• Such as red, orange, and violet, making the sky appear blue.

Explanation

• Cranes use movable pulleys to lift and move heavy loads.
• The pulleys are attached to a cable or rope that wraps around a drum or wheel.
• It allowing the load to be lifted or moved in a vertical direction.

Explanation

• Non-renewable sources, such as fossil fuels (coal, oil, and gas), nuclear energy, and minerals.
• They are limited in supply and cannot be replenished in a short period of time.
• Once they are used, they are gone forever.

Explanation

• The fuel in a car tank is a form of chemical energy, which is stored in the bonds of the fuel molecules (gasoline or diesel).
• This chemical energy is converted into other forms of energy (such as thermal and kinetic energy) through the process of combustion in the engine.

Explanation

• Kinetic energy is the energy of motion.
• It is the energy an object possesses when it is in motion, such as a rolling ball, a moving car, or a flying bird.
• The amount of kinetic energy an object has depends on its mass and velocity.

Explanation

• Fasteners (such as nuts and bolts) actually benefit from friction, as it helps keep them in place.

Disadvantages of friction:

• Energy loss: Friction converts useful energy into non-usable forms like heat.
• Wear and tear: Friction causes moving parts to wear out and deteriorate.
• Speed limit: Friction limits the maximum speed of automobiles.

Explanation

• The Earth takes approximately 23 hours, 56 minutes, and 4 seconds to complete one rotation on its axis, which is called a sidereal day.
• This is the time it takes for the Earth to rotate once relative to the fixed stars.
• The extra 4 minutes is due to the Earth's slightly ellipsoidal shape and the effects of the Moon's gravitational pull.