Heating Effect Of Current
An electric heater of resistance 20 Ω is connected to a 200 V supply for 10 minutes. How much heat is produced?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- heating effect of current
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
1.2 × 10⁶ J
- Joule's Heating Formula: H=RV2×t.
- Convert Values to SI:
- V=200 V.
- R=20 Ω.
- t=10 min=600 seconds.
- Step-by-step Calculation:
- Power=202002=2040000=2000 W.
- Energy(Heat)=2000 W×600 s.
- Final Value:
- 1,200,000 J =1.2×106 Joules.
This medium difficulty physics question is from the chapter current electricity, covering the topic of heating effect of current. It appeared in the 2025 exam.
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