sammy48167's version from 2015-10-29 15:36

Section 1

Question Answer
energyability to do work
anemometerdevice used for measuring wind speed
multimeterinstrument designed to measure electric current, voltage and resistance
biomassbiological material derived from living or recently living organisms, usually plants
absorptionthe process or action by which one thing absorbs or is absorbed
biofuelany fuel that is obtained from a renewable biological source
energy transformationprocess of changing from one form of energy to another
hydropowermechanical force of rapidly flowing or falling water from rivers or reservoirs. Renewable
rotorspinning part of the wind turbine- consists of blades and hub
circuitcomplete path around which an electrical current flows

Section 2

Question Answer
how does an incandescent bulb work?electrical charge flows from the base to a coiled wire filament made of tungsten, which gets so hot it gives off light
what are the pros and cons of incandescent bulbs?pros- cheaper, not toxic. cons- lasts only 1,000 hours, wastes light energy on heat, linked with greenhouse gas emissions
how does a Compact Fluorescent Lightbulb work?contains a gas-filled tube and a magnetic ballast. Electric current flows through them, gases emit UV light, which energizes a phosphor that coats the tube, which emits light
what are the pros and cons of CFLs?pros- 10,000 hours of life, uses up to 80% less energy, 75% less heat than incandescent bulbs. cons- more expensive upfront, but you save in the long run
what happens as energy demands increase?price goes up
why is insulation important for your house?it keeps heat inside your house, so you don't have to use as much energy to keep your house warm
how do you affect the Earth's climate?driving, eating, cooking, needing light
how does color affect absorptivity?light is made of all the colors of the rainbow, so when it hits an object, all the colors will be absorbed or reflected. Black absorbs all the colors because it contains no color, and white reflects all colors because it is all of the colors combined.
how can photovoltaic cells be used to produce electricity?solar cells have layers of boron (positive) and a layer of phosphorous (negative), which sit in a coating of silicon. When sunlight hits the cell, it initiates a flow of electrons from the negative to the postive layer, creating electricity
what is the process of hydraulic fracturing?fractures in the earth are created by pumping lots of fluids at high pressure into the ground. The fluid contains water, sand and gravel; and chemicals. The sand and gravel keeps open the fissures, which can contain oil. Fracking can reach down more than 1 mile, which is when it reaches natural gas. When the gas is fracked it floats up through the fracking hole to the wellbore. After injection, internal pressure causes fluid to return to the wellbore, and it is stored on site before treatment.

Section 3

Question Answer
pros and cons of solarpros- renewable, doesn't pollute, abundant, low maintenance, sustainable. cons- expensive, not constant, storage is expensive
pros and cons of biomasspros- renewable, abundant, converts waste into energy, carbon neutral. cons- releases CO2
pros and cons of hydro-electricpros- no pollution, renewable. cons- require land to be flooded to create reservoir, can damage ecology
pros and cons of nuclearpros- creates lots of energy, no air and water pollution. cons- produces radioactive waste
pros and cons of coalpros- uses an abundant domestic resource, cheap. cons- produces CO2, nonrenewable
pros and cons of natural gaspros- uses a clean burning fuel. cons- emits CO2 and other pollutants into the air when burned, nonrenewable

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