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While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.
We can travel on dual carriageways on the motorway.
The seminomadic lifestyle of the Bedouin adapted to the climatic and environmental conditions of the desert.
Physical properties, as well as the flora and fauna of the ocean change with depth.
Built in Neo-Byzantine style, this Orthodox cathedral is one of the symbols of the Bulgarian capital city.
The animation demonstrates the different flower types of angiosperms.
In transmission systems, the engine torque is modified by reducing or increasing rotational speed.
The Benz Patent-Motorwagen is widely regarded as the first vehicle propelled by an internal combustion engine.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.
The 'wise man' originated in Africa and dispersed throughout most of the continents.
The building commissioned by Pompey the Great was the first permanent theatre in Ancient Rome.
Carved into a granite cliff, the sculptures of the Mount Rushmore National Memorial depict four great United States presidents.
Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.
One of the best known buildings in the world, this is the residence and office of the President of the United States.
The New Horizons space probe was launched in 2006, with the objective to study Pluto and the Kuiper Belt.
This physicist-inventor and electrical engineer who mainly dealt with electrotechnics was undoubtedly one of the most brilliant figures of the second industrial revolution.
This animation presents some interesting facts in the field of astronomy.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
The bacterial disease known as the bubonic plague is one of the deadliest infectious diseases in the history of mankind.
The life cycle of vertebrates starts with the production of the reproductive cells of an individual and ends with the production of the reproductive cells of the next generation.
Majestic even in its ruins, this city was the largest and most populous settlement in the pre-Columbian Americas.
Seawater, as an external force, plays an important role in shaping coastlines.