b) Influences on resistance
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state the factors that influence the resistance in a wire
the material of the wire
the temperature of the wire
the length of the wire
the cross-sectional area of the wire
describe how the material of a wire influences its resistivity
conductors, semiconductors, and insulators have different resistivities
state the relationship between the temperature and the resistance of a wire
directly proportional
state how a high temperature in a wire causes a high resistance
positive ions and electrons have more kinetic energy
larger vibrations
more collisions
state the relationship between the length and the resistance of a wire
directly proportional
state how a longer length of wire causes a high resistance
more positive ions
more collisions
state the relationship between the cross-sectional area and the resistance of a wire
inversely proportional
state how a larger cross-sectional area of a wire causes a low resistance
more pathways for electrons to travel through
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