Q34 of 126 Page 198

Figure shows a part of an electric circuit. The potentials at the points a, b and c are 30 V, 12 V and 2 V respectively. Find the currents through the three resistors.


1A, 0.4A, 0.6A

Given, , and .


Let the potential at the joint be


Current through is


Current through is


Current through is


Now, Kirchhoff’s junction rule,







Therefore,




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32

Consider the circuit shown in figure. Find the current through the 10Ω resistor when the switch S is A. open B. closed.


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Find the currents through the three resistors shown in figure.


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Each of the resistors shown in figure has a resistance of 10 Ω and each of the batteries has an emf of 10 V. Find the currents through the resistors a and b in the two circuits.


 36

Find the potential difference Va – Vb in the circuits shown in figure.