|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.Read More...
|1 year 21 weeks ago|
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.Read More...
|6 years 21 weeks ago|
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.Read More...
|4 years 18 weeks ago|
|Energy Use in Cars 2: Constant Speed Cruising||
Keywords: air resistance, drag, efficiency, energy use in cars, fuel economy, vehicle transportation
If a body in motion tends to stay in motion, why do we need to burn gas to travel at highway speeds?
Why do we need to burn gas to keep travelling at the same speed? The basic answer is "because if we didn't, eventually the car would stop." In everyday life, there is always friction and air resistance that opposes any motion, and if you leave a moving object alone, this friction and drag will eventually cause it to stop. This lecture looks at how this drag impacts a car.Read More...
|6 years 39 weeks ago|
|Energy Use in Cars 1: Stop-and-Go Driving||
Keywords: efficiency, energy use in cars, fuel economy, kinetic energy, vehicle transportation
When does cycling cost more in fuel than driving?
People recommend commuting by bicycle rather than by car to save energy. However sometimes when a cyclist pushes the button to make a traffic light change, it means that a bus full of people has to stop. When a cyclist makes the bus stop like this, is the extra fuel it has to burn to get back up to speed MORE than the fuel saved by choosing to commute by bicycle rather than car?Read More...
|6 years 39 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.Read More...
|6 years 15 weeks ago|