A projector lamp is rated for 75 volts and has hot resistance of 25ohms. Solve the value of series resistance which will operate the lamp for 220 volts supply
220/(25+R)=75/25=3→R=48.33 (Ω)220/(25+R)=75/25=3\to R=48.33\ (\Omega)220/(25+R)=75/25=3→R=48.33 (Ω) . Answer
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