Question

An electric iron of resistance of 20 Ohms takes a current of 5A. Calculate its electrical power and the heat generated by it in 15 sec.

Answer 1

Answer:

Given Data:

• Resistance = 20 ohms
• Current = 5 A
• Time = 15 sec

To Find:

• Electrical Power
• Heat Generated

Solution:

⇒ Power = I²R

⇒ Power = ( 5 )² × 20

⇒ Power = 25 × 20

⇒ Power = 500 W

According to Joule's Law Of Heating,

⇒ Heat = I²RT

⇒ Heat = Power × Time

⇒ Heat = 500 W × 15 sec

⇒ Heat = 7500 J

Therefore Electrical Power is 500 W and Heat Generated is 7500 J.

Answer 2

Answer:

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