Презентация, доклад на тему Электрический ток на английском для СПО

Ohm's law.
6. Employment of an electric current.
7. Power of the electric current.
8. Joule -Lentsa.

particles. For the direction of the current take the direction of the positively charged particles; If the current is created negatively charged particles (such as electrons), the current direction opposite to consider the motion of particles.

An electric current

heating action
The electric lamps fine tungsten wire heated to brilliant glow.

chemical action
In some solutions of acids, salts, alkalis while passing therethrough e. ie. there is the discharge of substances.

magnetic action
When the circuit is closed, the iron objects are magnets. With the disappearance of current in the iron object is demagnetized.

cross section of the conductor in one second.
The strength of the current is the ratio of electric charge q, passing through the cross-section, at the time of its passage t.
Unit current Ampere (A).
I = q /t
1 Кл = 1А х 1с
The instrument measures the current strength -ampermetr. It includes an ammeter in series with the device, wherein the amperage is measured.

denoted by letter U.
Tension shows what kind of work does the electric field when moving the unit positive charge from one point to another.
U is equal to the work against the current at the site to the electrical charge passed on this site:
                                          U = A: q
The unit volt voltage named after the Italian scientist Alessandro Volta, who created the first cell.
                                     1B = 1 J: Kl
Voltage is measured by a voltmeter. It is included
the circuit in parallel to the device,
who need to measure the voltage.

of resistance is the resistance of 1 ohm take such a conductor, which ends at a voltage of 1 volt current is 1 ampere.
                                   R = U / I
                                1 ohm = 1B: 1A
                              
The reason for the resistance is the interaction of moving electrons and ions of the crystal lattice.

Other conductors have different resistance due to the differences in the structure of their crystal lattice, because of the different length and cross sectional area.

the ends of the circuit and the resistance of this area is called Ohm's Law after the German scientist Georg Ohm who discovered the law in 1827
Ohm's law:
       The strength of the current in the circuit area is directly proportional to the voltage at the ends of the plot, and inversely proportional to the resistance.

                                   I = U: R

                                U = I R, R = U / I

the circuit is equal to the product of voltage at the ends of this portion on the amperage and the time during which performs work.
       A = U It or A = U q

1 joule = 1 volt amperes x 1 x 1 second or 1 J = 1 x A x s.

To measure the electric current of work needed three instruments: voltmeter, ammeter, hours

done per unit of time. Therefore, to find the average power of the current, it is necessary to divide the job on time: P = A: t
Employment of an electric current equal to the product of voltage and amperage for the time: A = U It, therefore, P = A: t = UIt: t = UI. 1W. 1Vh1A

flows, the current is equal:
        A = UIt, Q = UIt, consequently A = Q.
Using Ohm's law, the amount of heat can be generated by a conductor, expressed in terms of current, resistance of the circuit and time. Knowing that U = IR, obtain: Q = IRIt.
This conclusion was reached independently by the British scientist James Joule and Russian scientist? Heinrich Lenz. Therefore, the conclusion stated above is called the law of Joule.