What is state of stress at a point?
A general stress state of a point in a solid consist of three normal stresses σx, σy, σz and six shearing stresses τxy, τyx, τxz, τzx, τyz, and τzy as shown in figure 1. Figure 1: General Stress State. Each of the stresses (or stress components) represents a force per unit area acting on the small cube of material.
How many independent stress components will be needed to define stress at a point in a three dimensional body?
The no. of stress components will be 9. It’s a three dimensional case. There are three normal stresses namely sigma x, sigma y and sigma z.
Where does principal stress occur in a component?
It is defined as the normal stress calculated at an angle when shear stress is considered as zero. The normal stress can be obtained for maximum and minimum values.
What is a stress element?
Stress elements are a useful way to represent stresses acting at some point on a body. Isolate a small element and show stresses acting on all faces. Dimensions are “infinitesimal”, but are drawn to a large scale.
What is the formula of load?
Multiply the mass of the object by the gravitational acceleration of the earth (9.8 m/sec2), and the height in meters. This equation is the object at rest’s potential energy. Potential energy is measured in joules; this is the load force.
How is load percentage calculated?
The load factor percentage is derived by dividing the total kilowatt-hours (kWh) consumed in a designated period by the product of the maximum demand in kilowatts (kW) and the number of hours in the period. In the example below, the monthly kWh consumption is 36,000 and the peak demand is 100 kW.
How is connected load calculated?
Procedure for Determination of Connected Load 1 Bulb / Fan – Actual rating or 60 Watt each, if it is not possible to read the rating on the bulb / fan. 2 Tube Light – Actual rating or 40 Watt each 3 Light Plug – 60-Watt upto three plugs and extra 60 Watts for every three plugs or less.
What is connected load kW?
Type of Supply & Connected Load (Fixed charges of each State/DISCOM): Connected (or Sanctioned) Load is the total pool of supply that is given to a meter. This is calculated in kW (or Killo-Watts). This is not your actual energy consumption and only impacts fixed charges on your electricity bill.
What will be the breaking force when a wire can withstand the maximum load?
Breaking force = Breaking stress × Area of cross-section. When the wire is cut to half, there is no change in the area of cross-section of the wire. Therefore, there is no change in the maximum load (i.e., breaking force) the wire can support.
How do you find the maximum load on a beam?
As van Giel has written you need to know the length of the beam and also whether it is a cantilevered support or simply supported or fixed etc. Then the maximum bending moment can be calculated. Using the formula Working stress = My/I calculate the load.
What is the maximum load that can be connected in a circuit?
Maximum load of 800 watts can be connected in a circuit connecting only lighting points.
What is the maximum load on a switch board?
Switchboards and panelboards provide similar functionality in a power distribution system. Panelboards are typically limited to a maximum of 1200 A incoming current (main), either flush mounted within a wall or surface mounted to a wall.
Which material is used for wiring?
Electrical wire is made of materials like copper, aluminium and silver. As silver is expensive, mostly copper and aluminium are used in wiring. It is a good conductor of electricity.
How many power points can you have on one circuit?
There are basic rules about how much current will be used in a single circuit based on the number of GPOs it feeds. To take a practical example: 20 GPOs, each rated at 10 amps (in practice this is 10 points each with two sockets) are assessed by the wiring rules as likely to need a maximum current draw of 10 amps.
Can having too many things plugged in cause a fire?
A power point overload occurs when you exceed the maximum amperage of the electrical circuit you are using. This can be caused by plugging too many appliances into the one power point or running appliances that draw high amps at the same time. The result of an overload can be a short circuit and quite possibly a fire.
How many outlets can be on a breaker?
Technically, you can have as many outlets on a 15 amp circuit breaker as you want. However, a good rule of thumb is 1 outlet per 1.5 amps, up to 80% of the capacity of the circuit breaker. Therefore, we would suggest a maximum of 8 outlets for a 15 amp circuit.