A Model for Electrical Conduction
(7.23) 
(7.24)
A Model for Electrical Conduction
(7.25)
(7.26)
(7.27)
(7.28)
(7.29)
Resistance and Temperature
(7.30)
α is the temperature coefficient of resistivity.
(7.31) |
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(7.32) |
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(7.33)
(7.34)
Resistance and Temperature
Resistivity versus temperature for a metal such as copper.
Resistivity versus temperature for a pure semiconductor, such as silicon or germanium.
Superconductors
There is a class of metals and compounds whose resistance decreases to zero when they are below a certain temperature Tc, known as the critical
temperature. These materials are known as superconductors.
Electrical Power
(7.35)
(7.36)
Electromotive Force
Because the
potential difference at the battery terminals is constant in a particular circuit, the current in the circuit is constant in magnitude and direction and is called direct current.
The emf of a battery is the maximum possible voltage that the battery can provide between its terminals.
Electromotive Force
Resistors in Series and Parallel
