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What is the required resistance of the h...

What is the required resistance of the heater coil of an immersion heater that will increase the temperature of 1.50 kg of water from `10^(@)C` to `50^(@)C` in 10 minutes while operating at `240V`?

A

`25ohm`

B

`12.5ohm`

C

`250ohm`

D

`137.2ohm`

Text Solution

Verified by Experts

The correct Answer is:
D
use Joule.s law
`Q = msDelta(t) rArr "but" Q = i^(2) Rt = > Delta(T) alpha i^(2)`
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