How many watts in a walk?

• Position: TECHNOLOGY - Brief article

Some people exercise by "power walking," but now, walking can actually provide electrical power: Researchers have developed a knee-mounted electrical generator that turns walks into watts. The device, resembling a knee brace, harnesses power from part of the stride. One device on each leg can produce about five watts of electricity--enough to run 10 cell phones--says J. Maxwell Donelan, the lead researcher at Simon Fraser University in British Columbia. The generator could potentially power medical devices like prosthetic limbs, and the power generated could be stored in batteries. Harvesting energy from human...