CUET · PHYSICS · PYQ PAPER 2023
A heating element is marked 210 V, 630 W. The current drawn by the element and the resistance of the element when connected to 210 V DC mains would respectively be :
- A 4 A, \( 60 \, \Omega \)
- B 3 A, \( 70 \, \Omega \)
- C 8 A, \( 40 \, \Omega \)
- D 6 A, \( 10 \, \Omega \)
Answer & Solution
Correct Answer
(B) 3 A, \( 70 \, \Omega \)
Step-by-step Solution
Detailed explanation
\(I = \frac{P}{V} = \frac{630}{210} = 3 \, \text{A}\) \(R = \frac{V}{I} = \frac{210}{3} = 70 \, \Omega\)
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