20 Electric Power

The principles of electric wiring and wiring terminology include:

• Safety, proper insulation, correct wire sizing, and clear labeling

• Only using the cheapest materials available

• Ignoring color codes and wire sizes

• Connecting wires without insulation or labeling

Electricity is defined by which of the following terms and principles?

• Flow of electric charge, voltage, current, and resistance

• Photosynthesis, respiration, and transpiration

• Gravity, inertia, and momentum

• Evaporation, condensation, and precipitation

Estimating electric needs and loads involves which of the following methods?

• Calculating the total wattage of all devices and applying demand factors

• Guessing based on previous bills

• Using only the number of outlets in a building

• Assuming all devices run at maximum capacity all the time

The principles of alternating current (AC) and direct current (DC) involve differences in the direction of current flow. Which statement correctly describes this difference?

• AC changes direction periodically, while DC flows in one direction only.

• AC flows in one direction only, while DC changes direction periodically.

• Both AC and DC change direction periodically.

• Both AC and DC flow in one direction only.

The sources of electric power are:

• Fossil fuels, nuclear energy, hydroelectric power, and renewable sources

• Only fossil fuels

• Only solar energy

• Only wind energy

Which of the following are examples of alternative power systems?

• Solar and wind

• Coal and oil

• Natural gas and diesel

• Nuclear and gasoline

Demonstrate the use of various meters designed to help people work safely around electricity.

• By using devices such as voltmeters, ammeters, and insulation testers to check electrical parameters and ensure safety.

• By only relying on visual inspection of electrical equipment.

• By using meters only after an accident has occurred.

• By avoiding the use of any meters when working with electricity.

Electricity is energy that consists of charged particles, such as ________.

• electrons

• neutrons

• photons

• protons

When a charge builds up in one place, it is known as ________.

• static electricity

• current electricity

• magnetic field

• thermal energy

When electricity flows along a path, it is called ________.

• electric current

• electric charge

• electric field

• electric resistance