Electrification and electric current
Answers are for parents and teachers.
1
List five current sources at home (battery, accumulator, mains, etc.).
Sample: remote battery, phone accumulator, solar calculator, watch battery, mains.
2
Do the experiment of rubbing a balloon and sticking it to a wall and explain in writing.
Rubbing transfers electrons, the balloon becomes charged and attracts the neutral wall.
3
Draw the structure of an atom and label the proton, neutron and electron.
Nucleus (p+, n) in the centre with electrons (−) around it.
4
Why is it dangerous to stand under a tree during lightning?
A tree conducts, lightning strikes it and the discharge can pass to a person.
5
Name one conductor and one dielectric object and say what each is for.
Copper wire — carries current; its plastic coating — protects.