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Transformers
A transformer is used to transfer energy. Due to the transformer electric power may be transferred at a high voltage and reduced at the point where it must be used to any value. Besides, a transformer is used to change the voltage and current value in a circuit. -0
1. a) Cover the right column and read the English words. Translati them into Russian and check your translation. b) Cover the left column and translate the Russian words back intiEnglish.
сердечник обмотка виток повышать -3G- Fig. 10 Fig. 11 A two-winding transformer consists of a closed core and two coils (windings). The primary winding is connected to the voltage source. It receives energy. The secondary winding is connected to the load resistance and supplies energy to the load. The value of voltage across the secondary terminal depends on the number of turns in it. In case it is equal to the number of turns in the Primary winding the voltage in the secondary winding is the same as in the primary. -31-
1. A transformer is used 2. Electric power is transferred at a high voltage and reduced to any value 3. A transformer consists of 4. The function of the primary is
a) to store charge. b) to prevent the change of energy. c) to transfer energy. d) to change the voltage and current valuj in a circuit.
a) due to resistors. b) due to capacitors. c) due to transformers.
a) cores only. b) the primary and the secondary winding^ c) a core and the primary and the secori dary windings.
a) to prevent the change of voltage. b) to supply energy. c) to receive energy. -зг- 5. The function of the secondary is 8. A transformer with an iron core 9. A transformer with an air core is used 10. In a step-up transformer 11. A transformer should be substituted
a) to receive energy. b) to supply energy. c) to transfer energy. d) to decrease the value of charge.
a) is used for high-frequency currents. b) is used for low-frequency currents.
a) for high-frequency currents and for low-frequency currents. b) for high-frequency currents only.
a) the number of turns of the secondary winding is greater than the number of turns of the primary. b) the number of turns of the primary winding is greater than the number of turns of the secondary. c) in case it has an open in the winding. d) in case it has a short between the primary and the secondary. e) in case it has a short between turns.
5. Pair work. Put these questions to your groupmate and ask him/her * Read the words and write down their Russian equivalents: answer them.
[рэ 'seksnd] per second к Put down the Russian for:
Lne time ______________ five times ______________ kixty times _____________
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