All the rest of the universe becomes external. With this in mind, we can see that gravity and normal forces are external, while the frictional forces between pucks are internal. Since all the external forces cancel out with each other, there are no net external forces.

5. What is the unit of virtual unit load? Explanation: Its unit can be anything as it will cancel with that of n. Δ = displacement caused when force is increased by a small amount.

Internal forces are the forces that emanate from within a system. The system must be defined by you/problem. External forces are the forces that emanate from outside the system. Action or reaction force has no difference.

Introduction. Learn about structures and the natural forces that can affect them. The external forces such as wind, water and the vibration of the earth when an earthquake happens create internal forces within a structure.

Engineers determine the loads or external forces that act upon a structure. When external forces are applied to a structure, internal stresses (internal forces) develop resistance to the outside forces. The opposition of external and internal forces is what holds the structure together.

Newton’s second law states that the magnitude of the net external force on an object is Fnet=ma. Since weight g=9.80m/s2 on Earth, the weight of a 1.0 kg object on Earth is 9.8 N, as we see: w=mg=(1.0kg)(9.8m/s2)=9.8N.

Electric energy = electric power × time = P × t. Thus the formula for electric energy is given by: Electric energy = P × t = V × I × t = I2 × R × t = V2t / R. S.I unit of electric energy is joule (denoted by J), where 1joule = 1watt × 1 second = 1volt × 1ampere × 1second.

What is electrical energy? Electrical energy is a type of kinetic energy caused by moving electric charges. The amount of energy depends on the speed of the charges – the faster they move, the more electrical energy they carry. Let’s imagine an electric charge is represented by a ball being thrown against a window.

P = E/t: This formula is also called the mechanical power equation. Here E stands for energy in joule and t stands for time in seconds. This formula states that the consumption of energy per unit of time is called power.

1 W = 1 J/s. Power = force multiplied by speed (velocity) P = F × v….ALTERNATING CURRENT (AC) ~

The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force.

An open circuit implies that the two terminals are points are externally disconnected, which is equivalent to a resistance R=∞ . This means that zero current can flow between the two terminals, regardless of any voltage difference.