Exam

Question 1

1. Energy Basics

Answer 1

• Power Basics
• Electric Power value chain
• European Power Markets
• Global resources

Question 2

What are the 6 types of energy?

Answer 2

• Chemical: Stored energy released as the result of 2 or more atoms and/or molecules combining to form a chemical compound
• electrical: energy Energy associated with the flow of electrons Focus
• electromagnetic (waves): Energy associated with electromagnetic radiation including visible light, infrared and ultraviolet light, x-rays, microwaves, radio waves, and gamma rays
• mechanical: energy Energy that can be used to raise a weight
• nuclear.: Stored energy released as a result of particles interacting with or within an atomic nucleus)
• thermal: Energy associated with atomic and molecular vibrations that result in heat

Question 3

Ohm’s Law?

Answer 3

Current = Voltage/ Resistance

• Current (Ampere - A): the rate at which electrons flow through a conductor
• Voltage (Volt – V): the force (potential difference) that moves electrons
• Resistance (Ohm – Ω): degree by which materials oppose to electric current

Question 4

Electricity consumption represents the conversion of electrical power into other types of energy, give examples of energy types their effects and application forms

Answer 4

1. Mechanical energy –> Magnetism: Electric motors
   
   • Moving electrons create magnetic fields. These are used to spin a shaft, which creates mechanical energy
2. Thermal energy –> Heat Incandescent light bulb
   
   • When electrons move through a filament of tungsten, this starts to glow due to the heat
3. Electromagnetic energy –> Light: Fluorescent light bulb
   
   • Certain gases emit ultraviolet light when electrons move through them. This light than make the phosphor atoms in the incandescent tube glow
4. Electric energy –> Information transfer:
   
   • Transistors, chips By controlling electricity flows, numbers 0 and 1 can be represented, and so the transmission of information in binomial form is possible

Question 5

Define power:

Answer 5

• Power (Watt – W): amount of electricity required to perform a certain task (to move electrons through a specific device)
• Current (Ampere - A): the rate at which electrons flow through a conductor
• Voltage (Volt – V): the force that moves electrons

Question 6

Direct current?

Answer 6

• Electrons flow in one direction
• Direction of current does not change over time
• Generated, e.g., by electrochemical or photovoltaic sources

Question 7

Alternating current

Answer 7

• Electrons change flow direction over time
• Generated by electromagnetic power sources
• Turns per minute drive frequency of electrons changing flow direction

Question 8

Synchronous generator

Answer 8

Synchronous generator generates alternating current of specific frequency

Question 9

3-phase current Alternating current

Answer 9

• 3 alternating systems, each shifted 120º on a circle
• Current output of systems also shifted by 120° each