Question

3. An electric iron a, resistance 20 Ω takes a current of 5 A Calculate the heat developed in 30 s.​

Answer 1

H = I^2 R T

= 25 * 20 * 30

= 15000 Joules

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Answer 2

➲ ɢɪᴠᴇɴ :-

• Resistance (R) = 20Ω
• Current (I) = 5A
• Time (t) = 30 s

➲ ᴛᴏ ғɪɴᴅ :-

• Heat Generated (H)

➲ sᴏʟᴜᴛɪᴏɴ :-

We know that,

➨ H = I²Rt

Put the above given values in it, we get,

➨ H = (5)² × 20 × 30

➨ H = 25 × 20 × 30

➨ H = 500 × 30

➨ H = 15000 Joules

Hence,

• Heat developed is 15000 J