- #1
hasankamal007
- 42
- 0
Good Morning,
My TextBook says that -
Electric heaters use alloy material because they have higher resistance, which helps in producing heat.
What I say -
But more resistance means less heat at constant voltage because
1. H = I^2 R t and 2. P = V^2 / R[/U]
(For eq. 1 Current, I, has double importance. Decreasing R would increase I, which in turn on getting squared, would produce significantly more heat)
OR
(Current I is more valuable in producing heat than resistance R, see eq. 1)
So shouldn't we use metals of lesser resistance so as to produce more heat? I think using alloys would be much power efficient than metals, maybe that's why they use alloys.
Note: Please refer https://www.physicsforums.com/showthread.php?t=5608
Thanks in advance.
My TextBook says that -
Electric heaters use alloy material because they have higher resistance, which helps in producing heat.
What I say -
But more resistance means less heat at constant voltage because
1. H = I^2 R t and 2. P = V^2 / R[/U]
(For eq. 1 Current, I, has double importance. Decreasing R would increase I, which in turn on getting squared, would produce significantly more heat)
OR
(Current I is more valuable in producing heat than resistance R, see eq. 1)
So shouldn't we use metals of lesser resistance so as to produce more heat? I think using alloys would be much power efficient than metals, maybe that's why they use alloys.
Note: Please refer https://www.physicsforums.com/showthread.php?t=5608
Thanks in advance.