This guidance is for choosing batteries for general practical circuit work, where pupils experiment with low-voltage circuits by connecting batteries , torch bulbs, buzzers, small motors and other low-power components to investigate electrical characteristics, parallel and series circuits, etc. 

Explains the relative merits of three different ways of producing printed circuit boards by etching copper-clad boards.

To produce, by etching away unwanted copper, an electronic circuit board designed to meet a specific requirement.

To produce the track layout on a copper-clad board so that an electronic circuit can be made by etching away unwanted copper.