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15. C. Both A & B

Electric power can be transmitted through overhead systems and underground systems.

Electricity Transmission That is a process of distributing electricity from the power plant (Power Plant) to the Electric Distribution Channel (substation distribution) so that it can be directly distributed so that the public (consumers) use electricity.

Based on the installation on the transmission line is divided into two categories, namely:

1. Air Lines (Overhead Lines)

This transmission line will transmit electrical energy through a wire that is hung on an insulator between the tower / tower or transmission pole.

2. Underground cable

That is a transmission line that distributes electrical energy through cables that have been buried in the ground.

16. D. None of the above

Because the connecting conductors of electrical circuits in residential and industrial environments are called unipolar or multipolar electrical conductors.

Electrical conductors or conductive materials are those which have little resistance to the flow of electric current, given their particular properties. The atomic structure of an electrical conductor facilitates the movement of electrons through it, with which this type of element supports the transmission of electricity.

There are also unipolar or multipolar electrical conductors, which are officially used as connecting elements of electrical circuits in residential and industrial environments. This type of conductor can be formed inside by a copper wire or other type of metal material, covered with an insulating surface.

17.  B.There is no current flowing in the conductor

This is because if the electrical conductor is damaged, it cannot be a conductor of electricity, the conductor is zero as long as it is not electrified.

Electrical conductor (conductor) is a material that easily conducts electric current. The nature of conductivity is to move electrons from one electrical point to another easily. The main use of electrical conductors is to conduct electric current. The easy flow of electric current through an electric conductor is due to the content of electric charges that move easily when an electric field arises even in very small amounts. The electric field in a conductor is zero as long as it is not electrified

18. D. Thermal Energy - Kinetic Energy - Generator - Electrical Energy

Geothermal power plant or Geothermal Power Plant is a geothermal power plant. The electricity generated comes from geothermal heat that comes out of the bowels of the earth. The geothermal heat that comes out can be in the form of steam or hot water, then this geothermal heat will turn a turbine to produce electrical energy.

19. C. It's safer

This is because of the several advantages of alternating current indicating this current is safer and easier.

Alternating current (AC) is a current that changes its magnitude and polarity at regular time intervals.  For decades, alternating current has the advantage that it is more widely used than direct current. This is because alternating current is able to transmit power over long distances without losing a lot of energy. In addition, when compared to alternating current, direct current also has a higher risk of fire, is more expensive, and has problems when converted from high voltage and low current to low voltage and high current.

20. D. All of the above

The advantages of underground power lines show several advantages such as answer choices namely appearance and public safety, maintenance costs and frequency of errors, power failures and accidents than overhead power lines.

Advantages of Underground Power Lines

• Not easily affected by bad weather, lightning, and others.
• The aesthetic value is higher than the electrical installation of overhead lines
• Longer usage life limit.
• The inductance problem can be ignored

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