Question

an electric iron of resistance 25 ohm takes a current of 3A. calculate the heat developed in 30 s​

Answer 1

Answer:

H=I2RT

H=(3)^2x25x30

H=9x625x30

H=168750J

Answer 2

Given that:

• An electric iron of resistance 25 Ω takes a current of 3 A.

To Find:

• Heat developed in 30 seconds.

Formula used:

• H = I²RT

Where,

• H = Heat
• I = Current
• R = Resistance
• T = Time

Finding the heat developed in 30 seconds:

ㅤ↠ㅤH = (3)² × 25 × 30

ㅤ↠ㅤH = 9 × 25 × 30

ㅤ↠ㅤH = 6750

Hence,

• Heat developed in 30 seconds = 6750 Joules