Static Energy Flashcards
What happens to a polythene rod when it is rubbed with a duster
The electrons in the duster transfer to the polythene rod. The polythene rod now has more electrons than protons and is negatively charged.The duster has fewer electrons than protons and is positively charged
What does the gold leaf electroscope do?
This device to text electric charge (+or -). The gold leaf sticks up when charges are near the cap at the top. The greater the charge of the great the angle of the leaf
Negatively charging a GLE.
The negative charges in the rod are repelling the electrons in the GLE down to the bottom. Electrons in the GLE are are repelled by the electrons in the rod. The electrons in the gold leaf repel and rises. Done with a polythene rod near the cap at the top
Positively charging a GLE
Electrons in the GLE are attracted to the acetate rod and move upwards. Only positive charges are left in the bottom of the GLE. Like charges repel so the gold leaf rises. This is done with an acetate rod
What happens in a photocopier
1- the copy plate is given a charge
2- an image of the page to be copied is projected onto the charged copying plate
3- where light hits the pages the charge leaks away, leaving a pattern on the copying plate
4- Black ink powder is attracted to the charged particles of the plate.
5- the Black ink powder is transferred onto a piece of paper.
6- The paper is heated so the powder melts and sticks to the paper
7- this is now a photocopy of the original page
How can you protect a building from lightning
Fix metal (copper) to the outside of buildings. This creates an easy path for the lightning to run down the building and go straight into the ground. This is called an Earth down-conductor
Explain induced charges
A negatively charged rod attracts neutrally charged pieces of paper. The electrons in the tissue paper are repelled to the bottom of each piece by the electrons and the polythene rod. This means that they then attract other pieces of neutrally charged tissue paper. The negatively charged rod induces a positive charge at the top of the first piece of paper which causes them to attract
How does a balloon stick to the ceiling
The ceiling is neutrally charged. After rubbing it becomes negatively charged. Electrons are transferred from the cloth/hair to the ballon. When we bring the negatively charged ballon to the ceiling electrons are repelled in the ceiling. This leaves the area around the building in positively charged in the ceiling. The protons in the ceiling and electrons in the ballon attract. This is why the balloon sticks to the ceiling-attractive force is sufficient to hold the building into the ceiling
How is spray paint enhanced by using charges?
Do you object wanting to be painted e.g. a car door is negatively charged. Do you paint is then positively charged. Each droplets of paint has electrons pulled from it by the positively charged gone, leaving eat drop in at positively charged for
What happens to an acetate rod when it is rubbed with a duster
The electrons in the acetate to transfer to the duster. The acetate has more protons and electrons and is therefore positively charged. The duster has more protons and electrons and is negatively charged
Rob a polythene rod with a duster or piece of paper. Hold it close to the GLE without touching it
-What happens as you move the rod closer and further away from the GLE?
Repeat with acetate Rod
-What happens when you move the rod closer and further away from the GLE?
Polythene Road -Closer = gold leaf rises -Further away = gold leaf falls Acetate Rod -Closer = gold leaf rises -further away = Gold leaf falls
Rub a polythene rod and hold it close to the GLEwithout touching it. Without moving the road, touch the plate with your finger
-What happens to the leaf?
Now remove your finger, and then remove the Rod
-What happens now as you bring the rod closer and further from the GLE
What happens to the leaf when you are touching it with your finger and the rod is above your finger?-It goes up as it is positively charged
Once finger is removed: it has the opposite effect to what it normally has, so it falls when the road is closer and rises when it is far away
