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Electricity (Resistivity (In a thermistor the resistance decreases as the…
Electricity
Resistivity
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As the temperature in metal conductors increases so does the resistance. This is because as the temperature is higher, so is the kinetic energy, therefore the ions in the metallic structure vibrate more. As a result the delocalised electrons cant pass through the metal as easily, meaning the resistance has increased.
In a thermistor the resistance decreases as the temperature increases.Only negative temperature coefficient (ntc) thermistors will
be considered.
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Superconductivity as a property of certain materials which
have zero resistivity at and below a critical temperature
which depends on the material.
Powerful superconducting electromagnets used in Magnetic Resonance Imaging (MRI) and Nuclear magnetic resonance (NMR) machines, magnetic confinement fusion reactors, and the beam-steering and focusing magnets used in particle accelerators.
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Circuits
in series, RT = R1 + R2 + R3
in parallel, 1/RT= 1/R1+ 1/R2+ 1/R3
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In a DC circuit, all charge and all energy is conserved.
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Potential Divider
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A potential divider circuit means the input voltage must equal the output voltage, and using this idea you can work out any component of a circuit.
