Question

calculate the heat generated in an iron box, operated at 250V, if 4A current is passed through it for 1 minutes​

Answer 1

Answer:

P = i^2Rt

p= iVt

p=4×250×60

p= 60000 W

p= 60Kw

Answer 2

Answer:

An electric iron works on 230 V and current of 3 A flows through it for half an hour. How would one calculate the amount of heat energy generated?

Given ,

Voltage , V = 230 V

Current , I = 3 A

Time , t = 1/2 h = 30 min = 1800 s

We know that ,

Heat , Q = I² Rt

⇒ Q = ( IR ) It

⇒ Q = V I t   [ From Ω's law V = IR ]

⇒ Q = 230 * 3 * 1800

⇒ Q = 12,42,000 Joules

⇒ Q = 1,242 kW-s

So , the amount of heat energy generated is 1,242 kW-s

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