Consider the circuit shown in the figure. The current I3 is equal to :

(1) 5 amp

(2) 3 amp

(3) –3 amp

(4) –5/6 amp

Concept Questions :-

Kirchoff's voltage law
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If VAB=4V in the given figure, then resistance X will be :

(1) 5 Ω

(2) 10 Ω

(3) 15 Ω

(4) 20 Ω

Concept Questions :-

Kirchoff's voltage law
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The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is 

(1) 2

(2) 8

(3) 10

(4) 12

Concept Questions :-

Grouping of cells
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For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is 

(1) 1.38 V

(2) 1.68 V

(3) 2.04 V

(4) 3.10 V

Concept Questions :-

Heating effect of current
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Two batteries of e.m.f. 4V and 8 V with internal resistances 1 Ω and 2 Ω are connected in a circuit with a resistance of 9 Ω as shown in figure. The current and potential difference between the points P and Q are 

(1) 13A  and  3V

(2) 16A  and  4V

(3) 19A  and  9V

(4) 12A  and  12V

Concept Questions :-

Grouping of cells
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Four identical cells each having an electromotive force (e.m.f.) of 12V, are connected in parallel. The resultant electromotive force (e.m.f.) of the combination is :

(1) 48 V

(2) 12 V

(3) 4 V

(4) 3 V

Concept Questions :-

Grouping of cells
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The internal resistance of a cell of e.m.f. 12V is 5×102Ω. It is connected across an unknown resistance. The voltage across the cell, when a current of 60 A is drawn from it, is :

(1) 15 V

(2) 12 V

(3) 9 V

(4) 6 V

Concept Questions :-

Emf and terminal voltage
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The current in the given circuit is 

(1) 0.1 A

(2) 0.2 A

(3) 0.3 A

(4) 0.4 A

Concept Questions :-

Kirchoff's voltage law
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Consider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the internal resistance of the power supply)

(1)

(2)

(3)

(4)

Concept Questions :-

Heating effect of current
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In the circuit, the reading of the ammeter is (assume internal resistance of the battery be zero) :

(1) 4029A

(2) 109A

(3) 53A

(4) 2 A

Concept Questions :-

Kirchoff's voltage law
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Difficulty Level: