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Definition of electric shock
Electric shock is the physiological reaction or injury caused by electric current passing through the (human) body. Typically, the expression is used to describe an injurious exposure to electricity. It occurs upon contact of a (human) body part with any source of electricity that causes a sufficient current through the skin, muscles, or hair.
Very small currents can be imperceptible. Larger current passing through the body may make it impossible for a shock victim to let go of an energized object. Still larger currents can cause fibrillation of the heart and damage to tissues. Death caused by an electric shock is called electrocution.
Źródło: https://en.wikipedia.org/wiki/Electric_shock
Electrical installations
Jobs electrician relies primarily on the installation of electrical equipment. Additional duties of the repair of electrical installations, but more often during the installation electricians team takes care of it to ensure the longest operating electricity networks in a specific object without intervention. Very often, electricians during the installation of their own select appropriate cables, and so on, and the role of the customer is limited to the financing of the project. This is due to the fact that the electrician with extensive experience certainly much better than the person selects the equipment which has no idea about electrical engineering.
What we do with power from the socket?
Electricity is a very convenient way to transfer energy, and it has been adapted to a huge, and growing, number of uses. The invention of a practical incandescent light bulb in the 1870s led to lighting becoming one of the first publicly available applications of electrical power. Although electrification brought with it its own dangers, replacing the naked flames of gas lighting greatly reduced fire hazards within homes and factories. Public utilities were set up in many cities targeting the burgeoning market for electrical lighting.
The resistive Joule heating effect employed in filament light bulbs also sees more direct use in electric heating. While this is versatile and controllable, it can be seen as wasteful, since most electrical generation has already required the production of heat at a power station. A number of countries, such as Denmark, have issued legislation restricting or banning the use of resistive electric heating in new buildings. Electricity is however still a highly practical energy source for heating and refrigeration, with air conditioning/heat pumps representing a growing sector for electricity demand for heating and cooling, the effects of which electricity utilities are increasingly obliged to accommodate.
Źródło: https://en.wikipedia.org/wiki/Electricity