Use the drop-down menus to complete the sentences Athin wire has resistance than a thick wire, A short wire has resistance than

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Use the drop-down menus to complete the sentences
Athin wire has resistance than a thick wire,
A short wire has resistance than a long wire
A warm wire has resistance than a cool wire,
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Ben Gia 3 years 2021-07-25T15:04:14+00:00 2 Answers 12 views 0

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  1. Giakhanh
    0
    2021-07-25T15:05:22+00:00
    Reply

    Answer:

    A thin wire has a higher resistance than a thick wire

    A short wire has a lower resistance than a long wire

    A warm wire has a higher resistance than a cool wire

    Explanation:

    Here we have the formula for resistance by diameter given as follows

    R = \frac{4 \times \rho \times l}{\pi } \times \frac{1}{d^2}

    Where:

    R = Resistance

    ρ = Resistivity of the wire

    l = Length of the wire

    d = Diameter of the wire

    a. Therefore, since resistance is inversely proportional to diameter of the wire, a thin wire

    A thin wire produces a higher resistance value than a thicker wire with larger diameter, d

    b. Also as resistance is directly proportional to the length of the wire, a long wire has a higher resistance value than a short wire

    c. The formula for resistance of a wire with temperature is as follows;

    R_T = R_0 \times [1 + \alpha \times (T - T_{20})]

    Where:

    R₀ = Copper resistance at 20°

    R_T = Copper resistance at temperature T

    T = Copper conductor temperature

    T₂₀ = 20°

    α = Copper coefficient of resistivity

    Therefore, as the temperature increase, the resistance increases.

  2. haidang
    0
    2021-07-25T15:05:59+00:00
    Reply

    Answer:

    thin wire has  

    ✔ more

     resistance than a thick wire.

    A short wire has  

    ✔ less

     resistance than a long wire.

    A warm wire has  

    ✔ more

     resistance than a cool wire.

    Explanation:

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