Electricity 205: Conductors, Resistors, and Electric Current

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If a wire of length $l$ and cross-sectional area $A$ has a resistance of $4 \Omega$, what is the resistance of another wire of the same material with length $l/2$ and cross-sectional area $2A$?

$1 \Omega$

According to the given text, what is the resistivity of manganese at 20°C?

$1.84 \times 10^{-6} \Omega \text{m}$

Which of the following factors does NOT affect the resistance of a conductor?

Color of the conductor

If the potential difference across an electrical component decreases to half of its former value, and its resistance remains constant, what happens to the current through it?

The current halves

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Alloys have a higher melting point than pure metals, which is desirable for heating elements.

If the resistivity of a material is low, what can be inferred about its ability to conduct electricity?

It is a good conductor of electricity.

Which of the following statements is correct regarding the flow of current through a thick wire versus a thin wire of the same material?

Current flows more easily through a thick wire because it has lower resistance.

Which of the following materials is the best conductor, according to the data in Table 12.2?

Mercury

If the resistance of a conductor increases, what happens to the current flowing through it, assuming the potential difference remains constant?

The current decreases.

Which of the following statements is true regarding the relationship between resistance and temperature for metallic conductors?

Resistance increases with increasing temperature.

Learn about the motion of electrons in an electric circuit and how they are affected by resistance. Explore the difference between good conductors and resistors in terms of their resistance levels.

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