What factors affect the resistance of a wire at constant temperature?
Answer in your head, out loud, or on paper, then tap the card to flip.
What is meant by the term 'resistivity'?
Resistivity is defined as the resistance of a 1 m length of a conductor with a cross sectional area of 1m2.
Answer in your head, out loud, or on paper, then tap the card to flip.
What is the formula that links resistivity (ρ), resistance (R), area (A), and length (l)?
ρ = resistivity (Ωm)
R = resistance (Ω)
A = Area (m2)
l = length (m)
Answer in your head, out loud, or on paper, then tap the card to flip.
How does resistivity of a metal vary with temperature?
As temperature increases the resistivity of a metal increases.
Answer in your head, out loud, or on paper, then tap the card to flip.
What is the resistivity of a superconductor below the critical temperature?
Zero
Answer in your head, out loud, or on paper, then tap the card to flip.
What happens to the resistance of a wire as the length is increased?
The resistance increases.
Answer in your head, out loud, or on paper, then tap the card to flip.
What happens to the resistance of a wire as the cross-sectional area is increased but all other factors are kept the same?
The resistance decreases.
Answer in your head, out loud, or on paper, then tap the card to flip.