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The formula for the rate of heat transfer is expressed as which of the following?

1. Q/t = K.A.ΔT/ℓ
2. Q/t = K.A.ΔT/ℓ^2
3. Q/t = K.A.ΔT^2/ℓ
4. Q/t = K.A.ΔT^2/ℓ^2

Correct answer: Q/t = K.A.ΔT/ℓ

Solution

The formula Q/t = K.A.ΔT/ℓ represents the rate of heat flow through a material, where K is the thermal conductivity, A is the cross-sectional area, ΔT is the temperature difference, and ℓ is the thickness of the material. This is a standard result from heat transfer theory.

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