Radio
When is Radio Day celebrated in Russia?
on 7 May
This law describes the relationship between three key physical quantities: voltage, current, and resistance
Ohm's law
A semiconductor device used to amplify or switch electrical signals and power
Transistor
Complete the sentence with an appropriate preposition.
The future of the company will depend ___ how consumers respond.
on
What is the unit of frequency of radio waves?
Hertz
Choose the correct option.
Two objects with opposite charges will ... each other.
a) repel
b) attract
attract
Their job is to restrict the flow of electrons and reduce the current or voltage flowing by converting electrical energy into heat.
Resistors
Transform the word in brackets so that it fits into the sentence. Fill in the blank with the missing word.
There have been some major _____ in technology recently. (develop)
developments
Which scientists were involved in the invention of radio?
Alexander Popov, Joseph Henry, Guglielmo Marconi
Which comes first during thunderstorm: thunder or lightening? Why?
Lightening. Because light travels much faster than sound waves.
This component allows an electric current to flow through it in only one direction.
Diode
Read two sentences. Complete the second sentence so that it has a similar meaning to the first one. Fill in the blank with the missing word.
Most of the problems were because of human error.
Most of the problems were ___ to human error.
due
This scientist was the first to create, detect and measure electromagnetic waves
Heinrich Hertz
... ... is an electrical current that moves in one direction only.
direct current
This component consists of two pieces of conducting material (such as metal) separated by a non-conducting (insulating) material called a dielectric
Capacitor
Read the sentences in Russian and English. Complete the sentence in English so that it has a similar meaning to the sentence in Russian. Fill in the blank with the missing word.
Wireless technology made a great ... to long-distance communication.
Беспроводные технологии внесли огромный вклад в общение на дальние расстояния.
contribution
This scientist was the first to foresee that radio waves existed. His theory described light and radio waves as electromagnetic waves traveling through space.
James Clerk Maxwell
... ... is an electrical current that regularly changes the direction in which it moves.
alternating current
An electronic ... is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires through which electric current can flow
circuit
Transform the word in brackets so that it fits into the sentence. Fill in the blank with the missing word.
Rolls-Royce cars are famous for their quality and ____ (reliable)
reliability