A lamp is rated 240 V, 60 W. ...
A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when lit?
120Ω
240Ω
540Ω
960Ω
Correct answer is D
P = 60w, V = 240v, R = ?
P = V2R
: 60 = 2402R
→ R * 60 = 57,600
R = 57,60060
R = 960Ω
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