Class 10 Chapter 1 Electricity Physics Solution S.Chand. Part 5
Part 5 COMBINATION OF RESISTANCES (OR RESISTORS) Very Short Answer Type Questions 1. The law of combination of resistances in series states that the total resistance � � R s of resistors connected in series is equal to the sum of their individual resistances. Mathematically, it can be represented as: � � = � 1 + � 2 + � 3 + … R s = R 1 + R 2 + R 3 + … 2. If five resistances, each of value 0.2 ohm, are connected in series, the resultant resistance ( � � R s ) will be: � � = 5 × 0.2 = 1 Ω R s = 5 × 0.2 = 1 Ω 3. The law of combination of resistances in parallel states that the reciprocal of the total resistance ( � � R p ) of resistors connected in parallel is equal to the sum of the reciprocals of their individual resistances. Mathematically, it can be represented as: 1 � � = 1 � 1 + 1 � 2 + 1 � 3 + … R p 1 = R 1 1 + R 2 1 + R 3 1 + … 4. If 3 resistances of 3 ohms each are connected in parallel, their total resistance ...