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11 Cards in this Set
- Front
- Back
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Ohms Law |
Ohms Law states that when the physical factors remain constant voltage is proportional to current in a wire |
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How to reverse the effect of a thermistor as a potential divider |
Measure the voltage over the other resistor instead, or use the other type of thermistor |
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Resistance equation |
V/I=R V=IR I=V/R |
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Kirchoff's first law |
At any junction (node) the Σcurrent'in' = Σcurrent'out' |
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Kirchoff's second law |
ΣP.D's in a closed circuit = 0
Or put another way
Σemf's = ΣP.D drops |
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Coulomb Definition |
1 Coulomb is the amount of charge which flows past a point when 1A flows for 1 second Q=Ixt |
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Resistance Definition |
Resistance is the ratio of voltage to current. It is the limiting factor for the current, it limits the flow of current through a point R=V/I |
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Resistivity definition |
A measure of the resisting power of a material of a uniform (constant) cross sectional area per metre of length R=ρl/A ρ=RA/l |
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Potential Difference |
The difference in potential electrical energy between two point shows the amount of energy the charge is losing or gaining Voltage = Work done ÷ Charge Units (V) ( J) (c) |
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Power definition |
Power is the rate energy is transfered Power = Work done ÷ Time (w) ( J) (s) |
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Superconductor |
A superconductor is a wire or component made of a material that has a zero resistivity below a certain temperature, called its critical temperature. |
