Podcast
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 $2A$?
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?
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?
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?
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?
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?
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 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?
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?
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?
Which of the following statements is true regarding the relationship between resistance and temperature for metallic conductors?
