P2T1- Static and Current electricity

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  • Created by: Marauder2
  • Created on: 18-09-16 16:21
How are electrons transferred?
When two insulators are rubbed together.
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What happens when a polythene rod and a duster are rubbed?
The electrons move from the duster to the rod. The rod becomes negatively charged and the duster has an equal positive charge.
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What happens when an acetate rod and a duster are rubbed?
The electrons move from the rod to the duster. The duster becomes negatively charged while the rod becomes positively charged.
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What happens when synthetic clothing gets dragged over each other or your head?
Electrons get transferred, leaving static charges on both items. They get attracted/stick to each other and sparks may form as the charges rearrange themselves.
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Why does your hair stand up when it has a static charge?
The strands of hair repel each other.
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Why can you get shocks from car doors?
The friction between clothes and the synthetic car seat causes electron transfer. When you touch the metal door, the charge flows away, giving you a shock.
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Why can you get a shock from a door handle?
If you walk on nylon carpet with insulating soles, electrons get transferred from the carpet to you, building up in your body. When you touch a metal door handle, the charge flows to the handle, giving you a shock.
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How does a balloon stick to walls?
Rubbing a balloon against your head/clothes causes electrons to be transferred to the balloon, negatively charging it. The charges on the uncharged wall move around, the negative charges repel the negative balloon, leaving a positive surface.
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How does a charged comb pick up uncharged pieces of paper?
Electrons are transferred between your hair and the comb making it negatively charged. Holding it near the paper causes induction (as in the balloon example).
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How is lightning created?
Rain drops and ice bump together inside storm clouds, knocking off electrons, leaving the top of the cloud positively charged and the bottom negative, creating a voltage and spark.
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How do paint sprayers use electrostatic charges?
The spray gun is charged, charging the small paint drops. The paint drop repels each other, creating a fine spray. The object is given an opposite charge, attracting the paint. Less paint is wasted, you get an even coat and no paint shadows.
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Why can electrostatic charges cause a fuel filling nightmare?
As fuel exits the filler pipe, into a plane etc. static can build up. This can lead to sparks which might cause explosions in dusty/fumey places.
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Why is earthing beneficial?
Earthing provides an easy route for the charges to reach the ground, meaning no static builds up.The electrons flow down to the ground if they are negatively charged and up if they are positively charged.
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What is direct current and what supplies it?
Cells and batteries supply d.c. It is a current that keeps flowing in the same direction and the charge only moves in one direction.
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Other cards in this set

Card 2

Front

What happens when a polythene rod and a duster are rubbed?

Back

The electrons move from the duster to the rod. The rod becomes negatively charged and the duster has an equal positive charge.

Card 3

Front

What happens when an acetate rod and a duster are rubbed?

Back

Preview of the front of card 3

Card 4

Front

What happens when synthetic clothing gets dragged over each other or your head?

Back

Preview of the front of card 4

Card 5

Front

Why does your hair stand up when it has a static charge?

Back

Preview of the front of card 5
View more cards

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