Question

Find the amount of current flowing through an electric iron of resistance
20°C if 15,000 J of heat is produced in it in 30 seconds.​

Answer 1

Explanation:

H=I²RT

15000=20²×I×30

15000=400×30×I

I=15000/12000=15/12=5/4=1.25A

Answer 2

CORRECT QUESTION :-

Find the amount of current flowing through an electric iron of resistance  20 Ω if 15,000 J of heat is produced in it in 30 seconds.​

Given :-

• Heat energy = 15,000 J

• Resistance(R) = 20 Ω

• Time(t) = 30 s

To find :-

The amount of current flowing.

Acknowledgement :-

We know,

Heat energy = I²Rt

Where,

• I = Current

• R = Resistance

• t = Time

Calculation :-

According to the question,

15000 = I² × 20 × 30

⇒15000 = 600I²

⇒I² = 15000/600

⇒I² = 150/6

⇒I² = 50/2

⇒I² = 25

⇒I = √25

⇒I = 5 A

So, the amount of current flowing through the electric iron is 5 Amperes.