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How to use electricity?
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
Electric shock - what is it?
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
Wikipedia - so you want to be master electrician?
Master electricians go through extensive on-site and classroom training, with work in more formal settings such as schools or colleges. The designation "master" is only given to electricians who can display extensive job knowledge and are tested to have an extensive understanding of the electrical safety code.
There are no formal certifications of the "theatrical title, master electrician", as there are in some of the more mainstream trades, but in March 2003 ESTA, which merged with PLASA in 2010, developed a certification process. Those who pass this rigorous test will become ETCP Certified Entertainment Electricians - and will be recognized as the industry's best. The stagehands union, IATSE, come close in that they offer apprentice and journeyman levels of certification. In the future, IATSE, or some of the larger local affiliations may form a more formal method of certification, which may include the title of master electrician. In the meantime, almost every production, from high school shows to Broadway uses the term to describe their primary electrician, regardless of their skill level or experience.
Źródło: https://en.wikipedia.org/wiki/Master_electrician