How many lumens of brightness is enough? How many watts? Can dimmer flashlights be better? What about battery issues?

Jun 9, 2008 - Yuen Kit Mun

The wrong transformer can fry electronic devices. This article looks at safety precautions, watts, socket adapters and types of transformers to use in foreign countries.

Sep 3, 2009 - Yuen Kit Mun

In physics power is the rate at which energy is used or work is done. The average power is the energy divided by the time.

Apr 3, 2008 - Paul A. Heckert

Wind power generation has fierce opponents and devoted supporters. Are wind turbines noisy? How much power do electric windmills generate? Some wind energy answers.

May 30, 2007 - Joanne E. Brannan

This is part of a series on the Immune System. Macrophages are large cells that play an important role in the first line of defense inside the body against microbes.

Aug 31, 2009 - Noreen Kassem

New cancer research using bee venom and medical nanotechnology has been successful in targeting and killing tumor cells, presenting a possible future cure for cancer.

Aug 28, 2009 - Victoria Anisman-Reiner

New cordless drills are available in the larger 1/2 inch chuck size and can have as much torque as corded drills. However they continue to lack endurance.

Apr 15, 2009 - Yuen Kit Mun

A simple 12V solar power system can power lighting and entertainment in a shed or outbuilding without running AC power to it.

Feb 17, 2011 - Richard Mudhar

Want a small solar power system for your cabin? Don't know where to start? This article covers the basic information that you need to choose your solar kit.

May 24, 2011 - Angelika Ortlepp

The 8.9 magnitude earthquake that hit Japan on March 11, 2011, was determined to be the fifth most powerful earthquake since 1900.

Mar 12, 2011 - Ashley Anderson

The huge windmills that harvest power from the wind may soon be waving goodbye. A new design featuring vertical blades looks to be 10 times more efficient.

Jul 19, 2011 - Robert Adler

Measuring power consumption in the home using a real-time power monitor is the start to making real savings on electricity bills.

Mar 13, 2009 - Richard Mudhar

Measuring the power drain of equipment used in the home is the start to prioritising what needs using less, or what appliances should be switched off when not in use.

Mar 17, 2009 - Richard Mudhar

Planted aquariums are fun and a great outlet for creativity. But before adding plants to an aquarium, there are considerations to be taken into account.

Jan 31, 2011 - Aaron Guzman

The decibel is a unit-less, logarithmic ratio, whose exact meaning is known from the context in which it is used.

Jul 7, 2011 - Richard Walloch

How to choose the right CB radio. Brands, features, power, range, SSB, SWR antenna tuning. Handheld versus console models.

Sep 6, 2010 - Yuen Kit Mun

Kinetic energy is the energy of motion. The work energy theorem is a powerful problem solving tool. Heat or thermal energy is random kinetic energy.

Feb 26, 2008 - Paul A. Heckert

Slash your home electric bill and save energy and money with these simple tips.

May 9, 2010 - Santosh Das

Residential wind turbines represent a green and renewable energy technology and a way for the homeowner to lessen dependence on the electrical power grid.

Aug 24, 2008 - Kelly Smith

A calculation of the total energy density produced by protons in the Large Hadron Collider at CERN shows it is not likely to destroy Earth.

Sep 18, 2008 - Paul A. Heckert