power

Title Post date
Wind Turbines Keywords: kinetic energy, power, wind energy, wind turbines

Can wind turbines actually be used to harness a substantial amount of power?

The total energy available in wind and the power that can feasibly be extracted from it will be determined using the fundamentals of kinematics. Following, the limitations of location and machinery of wind turbines that restrict the amount of power that can be harnessed will be examined, before comparing the impact of wind energy with various other common sources of energy.

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7 years 10 weeks ago
Wave Power – A Simple Analysis Keywords: power, waves

Will wave power save us?

A look at the amount of power potentially available in water waves.

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7 years 8 weeks ago
Turn the Heat Off! Keywords: energy loss, heat loss, power

Do you save more energy by leaving the heat on at night or by turning it down and reheating the house the next day?

We examine the benefit of turning off the heat when you go out.

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7 years 9 weeks ago
Transmitting Electricity Keywords: power, resistance, resistivity, transformer, voltage

If high voltage is so dangerous, why do we transmit electricity that way?

Transmitting power at higher voltages ensures that power can be transmitted over long distances with minimal losses; if transferred at a low voltage, the transmission distance has to be greatly minimized, which is impractical.

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6 years 48 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 7 weeks ago
Hydro-Electric Dams Keywords: dams, greenhouse gases, hydro-electricity, power

Why is this beautiful valley in north-eastern BC about to be flooded?

A look at the generation of power by a hydro-electric dam.

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7 years 10 weeks ago
Hydro-Electric Dam Demo Keywords: dams, hydro-electricity, power

Energy from Water?

An estimate of the power output from a model hydro-electric dam.

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7 years 6 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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6 years 43 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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6 years 48 weeks ago
Fan Efficiency Keywords: efficiency, electric fan, power

How can we measure the efficiency of an electric fan?

When you're out shopping for an electric fan, it might be a good idea to look for one that not only keeps you cool, but keeps your energy consumption low, too. Using an anemometer, Kill-A-Watt meter and a little bit of math, you can figure out how efficient your fan really is.

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4 years 40 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 6 weeks ago
Bicycle Power Keywords: bicycle, chi-squared, power, spreadsheets

How can you measure the mechanical power required to pedal a bicycle by observing how it slows down when you stop pedalling?

The forces acting on a bicycle can be estimated by observing the rate at which it slows down when you stop pedalling. This technique can, in principle, be used for any transportation vehicle.

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5 years 26 weeks ago
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