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38 Cards in this Set
- Front
- Back
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Why can metals conduct electricity |
There contain free moving electron which can move through the entire structure |
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What happens when a battery is attached to a copper wire |
The free electrons are repelled by the negative terminal and are attracted to the positive one |
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Which ways do the electrons move |
Negative to positive |
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What is the unit for the charge of an electron |
Coulumb (c) |
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Whats is the charge of 1 electron |
-1.6×10 ^(-19) |
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What is the symbol for charge |
Q |
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Current=????/???? |
Charge ÷time |
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What doen n stand for |
Number of electrons |
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What doen e stand for |
Charge of an eletron |
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What doen I stand for |
Current |
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What doen I stand for |
Current |
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What doen A stand for |
Area |
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What doen v stand for ......(.electricity) |
Drift velocity |
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Voltage = |
Current × resistance |
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Electric charge is a property possessed by ? |
proton and electrons |
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Charging occurs when electrons are ? |
Transferred from one material to another |
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What is a static charge? |
The negative charge(electron) does not flow away from the rubbed region |
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A conductor can only be charge if |
It insulated from the earth |
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What is used to calculate Charge |
Electronmeter Gold leaf electroscope |
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Electric current is what in terms of charge |
The rate of flow of charge |
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Materials with full ionic or covalent bonded electrons |
Can't conduct |
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Define electric current |
A flow of charge |
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Describe The energy transfer from a battery to a lamp |
Electron gains electrical potential energy as it moves through the battery Each electron then transports this energy to the lamp As the go through the lamp filament ..they collide with the filament ions and so transfer energy |
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What is potential difference (voltage ) |
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P.d = |
Energy transfered / charge |
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Define electromotive force ....e.m.f |
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What is ohm's law |
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Resistance is measured in ? |
Ohm's |
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Why is resistance low at at low temperatures |
Electrons can drift past the positive metal ions with realative ease due fewer collisions happening to slow them down |
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What affects the resistivity |
Length Cross-sectional area Temperature |
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Resistance = |
pL/A |
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What is a superconductor |
Material with Zero or negligible resistance |
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What is a Transition Temperature |
The temperature at which the resistance of a material suddenly drops to zero |
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What are the advantages of having such a material (superconductor ) |
Less enery is wasted as heat |
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Applicatios of superconductors |
MRI scanners Particle accelerator |
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Power is? |
The rate at which energy is transferred |
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Power = |
W/t |
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In series circuits |
Current is the same, voltage splits and energy is conserved |
