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15 Cards in this Set
- Front
- Back
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Edexcel P2 Topic 1
Static & Current Electricity |
If you can answer all of the questions on these cards then you need all you need to know to ace your exam! |
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Describe the structure of an atom
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Protons and neutrons in the nucleus, electrons orbiting the nucleus in shells
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How can an object become electrostatically charged? |
When two different insulating materials are rubbed together, riction causes electrons to be transferred from one material to the other- the two materials become electrostatically charged
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Why must objects be insulators to build up an electrostatic charge?
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So that the charge isn't conducted away
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What is induction?
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Induction is when an electrostatically charged object is put next to a neutral object, repelling or attracting the electrons in this material so that it is more negatively charged on one side
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What are some examples of the dangers of static electricity?
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1) shocks from everyday objects e.g. walking along a carpet then touching a metal door handle 2) lightning is caused by a large spark forming between the clouds and ground 3)fuel rubbing against pipe produces sparks that could ignite fuel fumes
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Give an example of induction |
* A charged balloon sticking to a wall * A charged comb picking up small pieces of paper
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How can the issue of petrol fumes igniting be avoided?
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Use a bonding line to earth the charge
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What is earthing?
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Earthing is the process whereby electrons flow in a direction dependent on their charge to remove excess charge
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What are some uses of electrostatic charge?
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1) Insecticide sprays 2) electrostatic paint spraying 3) finger printers 4) photocopiers
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What is electric current?
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The rate of flow of charged particles
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What is a current in a metal?
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the flow of delocalised electrons
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What is the difference between alternating and direct current?
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Direct: current flows in only one direction (supplied by cells) Alternating: current changes direction many times a second (supplies by generators)
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How is the size of the current measured? |
Using an ammeter, placed in series
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Why can the ammeter be put in series?
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Because current is the same everywhere in the circuit and is conserved at junctions
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