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 $2A$?

$1 \Omega$ (correct)

$0.5 \Omega$

$4 \Omega$

$2 \Omega$

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

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

$1.84 \times 10^{-5} \Omega \text{m}$

$1.84 \times 10^{-7} \Omega \text{m}$

$1.84 \times 10^{-8} \Omega \text{m}$

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

Length of the conductor

Cross-sectional area of the conductor

Temperature of the conductor

Color of the conductor (correct)

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 Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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

Mercury Signup and view all the answers

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

The current decreases. Signup and view all the answers

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

Resistance increases with increasing temperature. Signup and view all the answers

Electricity 205: Conductors, Resistors, and Electric Current

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Questions and Answers

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 $2A$?

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

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

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

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

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

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

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

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