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CBSE Class 10 Answered

Two electric lamps 40W,220V and 60W,220V are connected in series with a supply voltage of 200V. Calculate the current drawn from the source.
Asked by as5878850 | 29 Jan, 2020, 07:34: PM
answered-by-expert Expert Answer
Power , voltage and resistance are related as,  P = V2 / R   .
 
Hence resistance R of a lamp that can deliver power P when it is connected across voltage V is given by
 
R = V2 / P
 
Resistance of 40W/220V lamp = ( 220 × 220 ) / 40 = 1210 Ω
 
Resistance of 40W/220V lamp = ( 220 × 220 ) / 60 ≈ 807 Ω
 
If both lamps are connected in series, then current I drawn from a source of voltage 200 V is given by,
 
I = 200 / ( 1210+807) ≈ 0.1 A  = 100 mA
 
Answered by Thiyagarajan K | 29 Jan, 2020, 08:19: PM

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