Energy Resources
Identify 3 renewable energy sources
biomass
biofuels
hydropower
wind
solar
Classify nuclear, heat and sound as types of energy
nuclear = potential
heat and sound = kinetic
magnet
motion - changing magnetic field
conductor (coil)
Why can you not easily use appliances from one country in another eg Australia and USA
electricity is produced at different frequencies, require a different plug/transformer
What is the date of the first day of spring
september 1st
Give 2 examples of how solar energy is utilised
photovolatic cells - electricity
steam generation / solar thermal heating (superhaeating water) - powerstation
heating / solar oven
photosynthesis - stored chemical energy
Describe the energy transfer that occurs when a television is turned on. What would be a wasted form of energy produced?
electrical -> light and sound
wasted: heat
In what form is electricity transmitted through the grid and why
AC alternating current
more efficient, lower transmission losses and easier to alter the voltage
What does OIL RIG and RED CAT + stand for
Oxidation is Loss of electrons
Reduction is Gain of electrons
reduction occurs at the cathode which is the positive electrode
What is the principals name
Mr Bromage
the ability to do work
you cannot see energy but rather the effects it has on matter/changes that occur
Define potential and kinetic energy and identify how it is calculated/determined
potential - energy that is stored ie chemical, nuclear, stored mechanical ie elastic, gravitational potention (PE = mgh)
kinetic - energy based on motion (KE = 1/2mv2)
Describe the process of electricity generation using a photovolatic cell
photons - create free electrons of n side silicon and positive holes in p -side. electrons flow from n-p side via external wires
Name and describe the different classifications of electrochemical cells.
primary - run out
secondary - rechargable reverse the reactions
fuel cell - need fuel to be constantly added to be oxidised
What is the date of Presentation Evening
Tuesday 25th October
Identify and describe the differences and similarities between biofuels and fossil fuels
fossil fuels - coal, oil, gas formed millions of years ago through geologic action (heat and pressure decomposition in absence of oxygen) impact on global warming
biofuels - ethanol and biodiesel are formed from plant and animal matter that is processed ie fermentation of sugars and transesterification of plant oils and animal fats considered carbon neutral
both fuels used in vehicles
Give an example of how kinetic energy can be changed into electrical energy
generator
wind turbine
What direction do electrons move between electrodes in an electrochemical cell
from anode (-) to the cathode (+)
What is the energy transfer process that occurs in a coal powerstation
chemical energy of coal transferred to heat energy
heat boils the water to steam
steam turns the turbine connected to the generator
creates electrical energy
What year did Mindarie Senior College open
2003
What is biomass and how is it used for energy
Living/Organic matter used as an energy resource. It is commonly burnt as a fuel to convert to heat energy.
Describe the changes to light, heat and chemical energy as a match is burnt
light and heat increase
chemical potention decreases
total of system is constant - becomes low level heat energy warming the surroundings
What compounds are used to create a controlled fission reaction in a nuclear reactor
uranium 235
neutrons
moderator - slows neutrons
control rods - absorb neutrons
water absorb the heat energy
explain why electrons cannot travel directly from n to p side of PV cell
their is a depletion zone formed where the p-n layers meet that the electrons are not able to move through
What is this years science week theme (2022)
Glass more than meets the eye