A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when
PHYSICS
WAEC 2022
A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when lit?
- A. 120Ω
- B. 240Ω
- C. 540Ω
- D. 960Ω
Correct Answer: D. 960Ω
Explanation
P = 60w, V = 240v, R = ?
P = \(\frac{V^2}{R}\)
: 60 = \(\frac{240^2}{R}\)
→ R * 60 = 57,600
R = \(\frac{57,600}{60}\)
R = 960\(\Omega\)
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