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CBSE Class 12-science Answered

A storage battery of emf 12V and internal resistance 0.5 ohm, is to be charged by a 120V D.C supply of negligible internal resistance. What resistance is required in the circuit for the charging current to be 3A?  Calculate: i)How much chemical energy from the dc source is converted to electrical energy? ii)How much electrical energy is converted to chemical energy in the storage battery?
Asked by rayyan20151 | 05 Jan, 2020, 01:52: AM
answered-by-expert Expert Answer
Charging circuit is shown in figure.
By applying Kirchoff's voltage law , we get,   3R + 12 + (3×0.5) = 120
 
From abov eqn., we get R = 35.5 Ω
 
If t is charging time in seconds, electrical energy converted into chemical energy in storage battery = ( 12 × 3 × t ) J = 36t J

If t is charging time in seconds, chemical energy converted into electrical energy in dc source = ( 120 × 3 × t ) J = 360t J
Answered by Thiyagarajan K | 05 Jan, 2020, 08:59: AM

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