energy

Title Post date
Renewable Energies Keywords: biofuel, electricity generation, energy, hydro-electricity, Renewable, solar energy, wind energy

Energy is always required, whether it be for the production of goods, the supplying of services, or for transportation. Can we reduce our emissions by turning to clean sources of energy? If so, why haven't we already?

A large portion of humanity's energy demands are met using fossil fuels. Switching from fossil fuel generation to cleaner sources could greatly reduce the carbon emission put out every year. There are many ways to obtain energy cleanly, each with their own advantages and challenges.

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2 years 10 weeks ago
Nuclear Energy Basics Keywords: energy, health, ionizing radiation, nuclear, power, safety

What is the physical basis of nuclear power? Is nuclear power good or bad for the environment, safe or dangerous for us?

A look at the energy in the nucleus of a uranium atom, how this can be used to provide a reliable source of energy, and impact of this on the environment.

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7 years 19 weeks ago
Light Bulb Efficiency and Hand Crank Energy Generation Keywords: breadboard, circuit, efficiency, electricity generation, energy, energy conversion, Lend an Experiment (LEx), lighting

What does it really take to power a light bulb?

This activity is part of the LEx (Lend an Experiment) Climate Kit. Students compare the power consumption of incandescent and LED bulbs through the use of hand crank generators and a simple circuit. Concepts include the conversion of mechanical to electrical energy, power and efficiency, and measurement estimation. There is an option to also investigate the efficiency of the hand crank generator.

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2 years 4 weeks ago
Heating Efficiency Keywords: efficiency, electric, energy, gas, power

Which is better: gas or electric heat?

Calculating or measuring efficiency means tracking the power all the way from source to end-user.

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7 years 4 weeks ago
Heat Balance in the Human Body Keywords: calories, energy, energy use, evaporation, metabolic rate, power, sweat, thermal radiation, thinking

How much energy does our body use? How do we keep cool when it is really hot out? Can we justify eating more when studying?

Treating the human body as a thermodynamic system, with food energy going in and heat flow due to radiation, convection, evaporation and conduction, we can see how we can maintain a constant core temperature in a huge variety of environmental conditions.

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7 years 9 weeks ago
Flying Keywords: aircraft, birds, energy, flight, transport cost

It takes energy to fly. How much?

We examine how much energy it takes to fly from A to B, whether by bird, model glider, small plane or 747.

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7 years 13 weeks ago
Energy Efficiency and the Jevons Paradox Keywords: consumption, efficiency, energy, jevons, solid state lighting

Will increasing efficiency really reduce energy consumption?

Increases in energy efficiency have been shown to increase, rather than decrease, consumption.

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6 years 49 weeks ago
Energy Cost of Transport Keywords: energy, transport

How much energy does it take to move a person or a tonne of freight from A to B?

We compare how much energy it takes to move something from A to B using a variety of means: road, rail, water, air, and if that something is a human, walking and bicycling.

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7 years 13 weeks ago
Energy cost of flying Keywords: energy, energy loss, flight, potential energy

Gliders and planes glide similarly. How similar?

The power required to keep a toy plane flying can be inferred from the way it glides. This technique also works for full-sized aircraft.

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5 years 51 weeks ago
Energy and Power Keywords: definition, energy, types, useage

What is energy? Why is it such a useful concept? How does it relate to power?

Energy is the capacity to do work (both are measured in Joules). Power is the rate at which energy is transformed from one state to another, often from a stored state into work (a Joule of energy transformed per second is a Watt of power). Subsistence living requires about 200 W per person. Western living requires about 10 kW per person. Humankind currently uses about 12.5 TW of power, most from fossil fuels. Ten billion people living a western lifestyle (the not-impossible goal of many futurists) would require 100 TW of power.

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6 years 8 weeks ago
Energy and Greenhouse Gas (GHG) Calculations Keywords: carbohydrates, energy, GHG production

How much Chemistry and Biology do you need to understand to estimate energy and greenhouse gas production? Very little.

Gain a basic understanding of energy and GHG production calculations.

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7 years 23 weeks ago
Cool Roofs Keywords: albedo, carbon dioxide, emission, energy, surface temperature

Can painting our roofs white offset tonnes of CO2 emissions??

In this article, we look at how we can save energy, reduce the Earth’s surface temperature and offset carbon dioxide emissions just by making our roofs and pavements a lighter colour!

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7 years 9 weeks ago
Comparing Energy and Heat Units Keywords: BTU, cost, energy, greenhouse gases, oil barrel, quad, R-value, thermal conductivity, thermal resistance, unit conversion, Watts

How do I compare heat and energy values given in different units?

A look at how to compare the costs of natural gas, gasoline and electricity and how to convert between various heat units including R-values, U-values, BTU/h, W and more.

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7 years 14 weeks ago
Commuting by car or cycle - which is better? Keywords: bicycle, Carbon footprint, consumption, cycling, energy, Food, spreadsheets

It's not actually that clear...

We set out to find how much of a change it would make environmentally if one cycled instead of drove to work and then further expanded our findings to include the variables of diet composition and material goods ownership.

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5 years 31 weeks ago
Clean Coal Keywords: energy, Fossil fuel, greenhouse gases, power

An oxymoron?

Calculating how much coal we have to burn in a typical large power station to produce 1 GWe for a year.

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7 years 19 weeks ago
Biofuel Keywords: biofuel, energy, solar radiation, transportation

Can plants be used to fuel my car?

A look at how much land is needed to plant corn so that the energy harvested is able to power a car for one year.

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7 years 20 weeks ago
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