an electric in Nigeria has a number of 60W coloured bulb. how many can be connected to a 240V supply through a 5A fuse

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

area of focus

prndulum needs thread, weight clock to time swings