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The rate at which heat transfers through a material is termed as heat current, and it can be expressed mathematically as:

1. h = dQ/dt
2. h = (T1 − T2)/R
3. h = dQ/dt + (T1 − T2)/R
4. h = dQ/dt − (T1 − T2)/R

Correct answer: h = (T1 − T2)/R

Solution

The formula h = (T1 − T2)/R directly represents the rate of heat flow (heat current) in terms of the temperature difference and thermal resistance, which aligns with the given definition.

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