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Compare the power used in the 2 CI resistor in each of the following circuits : (a) A 6 V battery in series with 1 f2 and 2 cd resistors. (b) A 4 V battery in parallel with 12 12 and 2 CI resistors. CBSE Class X Science SA 2 (3 Marks)

Answer»

ith 6 V Battery is 8 WExplanation:(i) Given, POTENTIAL Difference, V = 6 VSince resistances are connected in seriesHence, Equivalent Resistance of the circuit, R = 1 + 2 = 3 According to Ohm's LawV = IRor I = POWER used in the 2 resistancePower = = 8 W(ii) Given,  Potential Difference, V = 4 VSince 12 \Omega & 2 resistances are connected in parallelThe voltage across each COMPONENT of parallel circuit remains sameHence, the voltage across 2 resistor will be 4 V.Power consumed by resistor is given by   = 8 W



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