2015-08-21
902
1. Materials can be classified according to their electrical properties. 2. This method is based on the ability of a material to conduct electricity. 3. What materials are called conductors? 4. The materials that have very few or no free electrons are called insulators. 5. Electronics is defined in an English dictionary as "the study of conduction of electricity in a vacuum, in gases and in semiconductors". 6. When the cathode is heated, it emits electrons. 7. The electrons are repelled toward the plate by the negative voltage on the cathode. 8. If a negative voltage is applied to the plate, current does not flow.
Make up sentences from the following words. Put A in the Present Simple Passive, B – in the Present Continuous Passive.
A.
1. the/electrons/not/ attract/by/the/negative/voltage/on/the/ plate.
2. materials/classify/according/to/their/chemical/properties.
3. particles/can/set/in/motion?
4. not/on/it/ability/of/electricity/a/material/the/to/conduct/base.
5. flow/by/electrons/the/control/a/of/grid.
6. use/as/grids/amplifiers?
7. the/between/grid/place/the/cathode/and/the/plate.
8. not/such/call/semiconductors/materials.
9. the/more/the/better/you/will/words/translate/from/English/know/into/
Russian/you.
10. the/of/how/electrons/control/flow?
11. nowadays/the/losses/of/lighting/power/compensate/by/a/mirror/reflector.
12. conductors/materials/what/call?
B.
1. the/cathode/heat/by/the/heater.
2. the/current/make/to/flow/through/the/tube.
3. by/electrons/emit/cathode/the.
4. plate/the/current/decrease.
5. repel/the/toward/electrons/the/plate.
6. define/by/electronics/the/physicist.
7. to/voltage/a/negative/apply/the/plate.
8. of/electrons/the/describe/by/the/flow/student.
9. of/fundamentals/electronics/the/discuss.
10. semiconductors/and/and/insulators/consider/now/conductors.
Make questions to match the answers. All of them are in the Passive Voice.
For example:
Q – What is being discussed in the lecture room now?
A – The classification of materials is being discussed in the lecture room now.
1. Q – How …
A –Materials can be classified in many ways.
2. Q – What …
A – One of the ways is based on the ability of a material to conduct electricity.
3. Q – What particles …
A – Only charged particles inside the material can be set in motion.
4. Q – How …
A – Such materials are called conductors.
5. Q – Is …
A – The flow of electrons is being controlled.
6. Q – When …
A – The fundamentals of electronics are being discussed now.
7. Q – Who … by
A – The flow of electrons is being described by the student.
8. Q – What … with
A – The conductivity is being amplified with a number of new devices.
