Tematska nastava na satovima Engleskog jezika s prof. Dianom Singer

On Wednesday October 3, 2018 we visited the Techical Museum of Nikola Tesla, the great Croatian inventor, or scientist as he is often referred to . We participated in some of Tesla’s great inventions in action, and heard about Tesla himself. We observed a bronze egg stand upright, big radio transmitters and receivers, I and Reina have even been exposed to a several hundred thousand volt electric spark. The highlight of the visit to the museum was when lights dimmed, and the host said to prepare for another experiment . Seconds later we observed a two million lightning bolt flying through the air to the discharge cage. The only thing left to say is that if you haven’t already visited that museum, you should definitely do. So take your cameras, and prepare to feast your eyes on a fraction of this giant mind of Nikola Tesla.

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.

The usual waveform of alternating current (ac) in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. These currents typically alternate at higher frequencies than those used in power transmission.

 

crtež Nikole Tesle: Medea Arbanas, 1.D

 

 

Nikola Tesla from youth to age