Grade 7th or 8th
Take a dead frog. Now cut off the lower half of the body and hang it on a hook. Take some wires and hook them up to a large battery (or a few) now stick the ends of the wires into the frogs' legs, around the top of the thigh. If you do it right (you may want to research it a bit), the legs should jerk due to the electrical current.
get a pupil on an insulated elevation and have some low current electricity running from his/her hand to other hand
it won't hurt but his/her hair will look ridiculous
also you can get a few people on that insulation and get them to hold their fingers quite close together, make a circuit from firsts students hand to lasts and have some electricity again, a spark should jump from one to another, not that painful, altho be careful in the health and safety era with these...
Put 2 nails in a block of wood, and connect then to 120VAC. Balance a glass rod across the nails. No current will flow. Now heat the glass with a blowtorch. As it reaches its softening point, current will start to flow, actually heating the glass. Eventually it gets white hot and boils! This shows that melted glass is a conductor, even though solid glass is an insulator. It helps to measure the current, if you have an AC ammeter handy.
Be careful with the burn and electrocution hazards.
static electricity or creating a circuit
0 ความคิดเห็น:
แสดงความคิดเห็น