common generating system were recognized shortly after the development of the ‘dynamo’‚ commonly known as the generator. The first public power station was put into service in 1882 in London (Holborn). Soon a number of other public supplies for electricity followed in other developed countries. The early systems produced direct current at low-voltage‚ but their service was limited to highly localized areas and was used mainly for electric lighting. The limitations of d.c. transmission at low voltage
Premium Transformer Electric power transmission Electricity
PHYS 101-2 STUDY GUIDE 1. The study of stationary or resting charges. ____________________________ 2. ________________________ is a connection made to Earth. 3. ________________________ is the process by which electrons are added or removed from a body. 4. List the three modes of electrification. __________________________________________________________________________________________________________________________________________________________________________________________
Premium Transformer Alternating current Electricity
Safety Tips for Using Household Electrical Appliances Electric Heater Do not use an electric heater fitted with a 2-pin plug. Check for damage before use. Do not use an electric heater near any combustible materials. Keep children away from an electric heater. Avoid using portable electric heater inside a bathroom. Induction Cooker Switch off an induction cooker if its surface is cracked. Switch off an induction cooker by its control switch after use. Ensure good ventilation for
Premium HVAC Electricity Air conditioning
lightning protection system‚ with proper installation can save lives‚ protect structures‚ and provide peace of mind. To understand lightning protection‚ you first need to understand lightning. Lightning‚ by definition‚ is the discharge of static electricity from cloud-to-ground. Lightning is the energy created by friction from the rise and fall of hot and cold air masses in the clouds. This energy‚ which is only visible as lightning‚ retains a negative charge. To equalize‚ this negative charge must
Premium Lightning Electric charge Electricity
intro Electric motors are a part of almost everything we use‚ refrigerators‚ washing machines‚ ceiling fans‚ computer hard drives‚ and almost every other appliance and electronic device we use today.Electric motors were made practical and affordable by Nikola Tesla and his induction motor. Before Tesla invented the induction motor was the dc motor that was impractical because it required two electric supplies for just one motor and expensive to make because it required rare materials on the other
Premium Nikola Tesla Electric motor Alternating current
Westinghouse helped Tesla patent and develop his alternating current‚ which was eventually picked up by the Niagara Falls Power Company. History would show that Tesla won the battle due to the fact we still use alternating current today to supply electricity in our every day lives. However some of the greatest electrical inventions would not be possible today without
Premium Thomas Edison Nikola Tesla Alternating current
(kay rap)DEFINITION OF TERMS AC (alternating current) - In electricity‚ alternating current (AC) occurs when charge carriers in a conductor or semiconductor periodically reverse their direction of movement. Household utility current in most countries is AC with a frequency of 60 hertz (60 complete cycles per second)‚ although in some countries it is 50 Hz. The radio-frequency (RF) current in antennas and transmission lines is another example of AC. The usual waveform of an AC power circuit is a sine
Premium Alternating current Electricity Capacitor
Physics Moment of a force: Moment of a force = force x perpendicular distance of the line if action if the force from fulcrum Law of moments: When a body is in equilibrium the sum of the clockwise moments about any point equals the sum of the anticlockwise moments about the same point. Centre of mass: Centre of mass is the point where whole mass of the body assumes to be concentrated. II. If the vertical line through the centre of mass is outside the base it will be a topples but if it’s passed
Free Thermodynamics Energy Resistor
the same time they get young people they can mold to their own specific needs and make experts out of them. 2. You can work in another country Working as electrical engineer opens you lots of opportunities in other countries. Laws of math‚ electricity and physics are universal and your gained knowledge doesn’t limit you to only the country you studied in. There are a lot of international companies that need electrical engineers‚ also most of them are willing to employ people form other countries
Premium Electrical engineering Integrated circuit Electricity
Lesson 11. Topic “Heating effect of an electric current”. Grammar material: Articles. Text: “Heating effect of an electric current”. The production of heat is perhaps the most familiar among the principal effects of an electric current‚ either because of its development in the filaments of the electric lamps or‚ may be‚ because of the possible danger from overloaded wires. As you know‚ of course‚ a metal wire carrying a current will almost always be at a higher temperature than the temperature of
Premium Electricity