Calculate combined resistance.

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Solution

The resistances are connected is parallel then the resultant resistance is

$R = \frac{R_{1} \times R_{2}}{R_{1} + R_{2}}$

$R = \frac{3 \times 6}{3 + 6}$

The resultant resistance is $2 Ω$

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Q. Calculate the combined resistance in each case:

The given figure shows a battery having an EMF of 9V and internal resistance of $0.6 Ω$ , connected to three resistors A, B and C. ?

(a) Calculate the combined resistance of B and C.
(b) Calculate the total resistance of A, B and C.
(c) Calculate the total resistance of the circuit.
(d) Calculate the current in each of the three resistors A, B and C.
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