Match the synonyms.

Date: 2015-10-07; view: 390.

1. to generate:

2. terminal:

3. to conduct (electricity):

4. stream (of electrons):

5. to spin (motor):

6. to accumulate:

7. at rest:

8. to gain (electrons):

9. release (static electricity):

10. to alternate:

12. Complete the sentences:

1) A physical phenomenon associated with electric charge is __________________________.

2) A flow of electricity through a wire is __________________________________________.

3) The ability of a substance or an electrical circuit to stop the flow of an electrical current through it is _______________________________________________________________.

4) A material that conducts or transmits electricity is ________________________________.

5) A material with a very low electrical conductivity is ______________________________.

6) An electric current flowing in one direction only is _______________________________.

7) An electric current changing its direction back and forth between 50 and 60 times per second is ______________________________________________________________________.

8) An imbalance of electric charges on an object is _________________________________.

However, the flow of electric current cannot take place until the circuit is completed. When a battery or other electrical source is attached to a wire, which is connected to some form of resistance (a light, a bell, a motor, etc.), and a circuit is completed back to the source or to ground, free electrons are released into the wire, creating an electrical potential or voltage. The electrons bounce against other electrons in the wire which are repelled because they have the same electrical charge. They go on bouncing against other free electrons down the wire, causing a flow of electrons - an electrical current. Provided there is somewhere for the electrons to go, such as a lamp or a motor, where the energy is converted to another form of energy, the electrons flow out the far end.

Free electrons of one material move forcefully till they are freed of their orbits around nucleus and move to another. Electrons of one material decrease, it presents positive charges. At the same time, electrons of another increase, it has negative charges.