Power Failure in Mobile Phones (Electrochemic

Group 1 (1 to 12) Notice that their mobile phones drain battery faster in cold weather or after long use. They wonder how temperature and charging habits affect battery life.

Corrosion of Iron Structures During Rainy Sea

Group 2 (11 to 22)In a coastal town, residents observe that iron gates, pipelines, and railings rust rapidly after heavy rains.

Car Batteries Failing in Winter

Group 3 (23-35)In a hilly town, residents find their car batteries fail to start on cold mornings. Mechanics note that even new batteries show poor charge retention in winter.

Voltage Drop in Long-Distance Power Transmiss

Group 4 (36-60) A rural area experiences frequent voltage fluctuations. Engineers discover that long underground power cables corrode near joints, increasing resistance and causing power loss.