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Joule's law says H ∝ I2RT ∴ , H∝ R But H∝ V2T/R t herefore , H∝ 1/R then how can we say that more the resistance of a substance more the heat it gives.

Joule's law says H ∝ I2RT
∴ ,H∝ R
But H∝ V2T/R
therefore , H∝ 1/R
then how can we say that more the resistance of a substance more the heat it gives. 

Grade:10

2 Answers

Vikas TU
14149 Points
7 years ago
In case of H ∝ I2RT,
when it depends on R i remains constant.
And when H∝ V2T/R
then Voltage remains constant.
Both matters in their own consequences.
Sridharan N
115 Points
7 years ago
Here, when a quantity is said to be proportion, the others are taken to be a constant. SO, H is directly proportional to R.Best regards

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