Question

(a) State and explain Joule's law of heating.
(b) A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.; (a) State and explain Joule's law of heating.
(b) A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.

Answer 1

Answer:

Joule's law states the amount of heat production in a conductor is : Directly proportional to the square of electric current flowing through it. Is directly proportional to the resistance of the conductor. Directly proportional to the time for which electric current flows through the conductor.

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Answer 2

Explanation:

(a) Joule's heating law says that the heating power generated by an electric conductor is directly proportional to

• Its resistance  

• The square of its electric current flowing through the conductor.

• Time in which current flow  

$i.e H = I^2 Rt$

(b) The total Circuit Resistance, R = 40 + 60 = 100 Ω

The time it takes to pass current = 12 minutes = 30 s

Current on the loop= $VR = \frac{220}{100} = 2.2 A$

Heat produced =$I^2 Rt = (2.2)^{2} \times (100) \times(30) = 4.84 \times 100 \times 30 = 14520 J$

You can get all the answers of Chapter 1 in the link below:    

https://brainly.in/question/14961133

   

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