Найдите в тексте и напишите номера предложений в страдательном залоге. 1. There are two kinds of current namely direct and alterating.
2. A direct current flows in one direction and at a steady value.
3. Thus, the current which would flow in circuit containing a battery would be a direct current.
4. A direct current (abbreviated DC) in a wire is one in which free electrons always move in one direction.
5. A direct current does not change in magnitude.
6. It is measured by the quantity of electricity which passes any section of the conductor in one second.
7. We know an alterating current to reverse, i.e. to flow in alternate directions at regular intervals of time.
8. An electric current which flows back and forth at regular intervals is called an alterating current (abbreviated AC).
9. When this current rises from zero increases to a maximum but in an opposite direction, and finally, returns to zero again, we say that it has completed a cycle.
10. The number of cycles completed in one second is called the frequency of the current.
11. Thus, a current which rises to a maximum in each direction 50 times a second makes 50cps (cycles per second) or has frequency of 50 Hz.
12. The standart frequency of electrical current in Russia is known to be 50 Hz.
12. The frequency of radio waves is in the order of one million cycles per second.
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