Chapter 5 LO4 Energy Changes From Renewable Energy Sources

Question 1

The process of electricity generation by wind

Answer 1

Wind : KE of wind

Hub : KE of bladed/hub and main shaft.
LOSSES :Thermal and Sound

Gearbox : KE of high speed shaft
LOSSES : Thermal and Sound

Generator : Electrical Energy
LOSSES : Thermal and Sound

Question 2

The process of electricity generation by Solar PV

Answer 2

Sun : Radiant Energy

PV Panel : Electrical Energy
LOSSES : Thermal

Question 3

The process of electricity generation by a Hydroelectric Power Plant

Answer 3

Dam : GPE

Moving Water : KE
LOSSES : Thermal and Sound

Turbine : KE as it rotates
LOSSES : Thermal and Sound

Generator : Electrical Energy
LOSSES : Thermal and Sound

Question 4

Process of electricity generation by Tidal

Answer 4

Behind Tidal barrier : GPE

Moving Water : KE
LOSSES : Thermal and Sound

Turbine : KE as it rotates
LOSSES : Thermal and Sound

Generator : Electrical Energy
LOSSES : Thermal and Sound

Question 5

Process of electricity generation by Wave

Answer 5

Sun : Radiant energy produces wind w KE

Waves : KE of wind causes KE of waves

Wave generator : KE of waves causes tubes on surface of the ocean to gain KE.
LOSSES : Thermal and Sound

Generator : KE from oscillation tubes turns a generator forming electrical energy
LOSSES : Thermal and Sound

Question 6

Process of electricity generation by Biomass

Answer 6

Biomass Fuel : Chemical Energy

Burning Fuel : Thermal Energy

Steam : Thermal Energy
LOSSES : Thermal

Turbine : KE
LOSSES : Thermal and Sound

Generator : Electrical
LOSSES : Thermal and Sound

Question 7

Identify the main energy transformations in a wind turbine

Answer 7

Kinetic Energy transferred from the shaft connected to the rotor, through gearbox, to the generator, to relative rotational motion (KE) Between a metal coil and a magnetic field in the generator.

This results in electromagnetic induction. In other words, energy of relative motion is transferred into inducted electrical energy.