ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari

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Current Electricity [Numericals] (Solved)

Numerical – 1. A cell supplies a current of 0.6 A through a 2 ohm coil and a current of 0.3 A through a 8 ohm coil. Calculate the emf and the internal resistance of the cell.

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Numerical – 2. Four cells each of emf 2 V and internal resistance 0.1 ohm are connected in series. The combination is connected to an ammeter of negligible resistance, a 1.6 ohm resistor and an unknown resistor R₁. The current in the circuit is 2 A. (1) Draw a labelled circuit diagram for the above arrangement and (2) calculate :

(i) the total resistance of the circuit

(ii) the total emf

(iii) the value of R1 and

(iv) the potential difference across R1.

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Numerical – 3. Two resistors of 2 ohm and 3 ohm in parallel are connected to a cell of emf 1.5 V and internal resistance 0.3 ohm. Draw a labelled circuit diagram showing the above arrangement and the current drawn from the cell.

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Numerical – 4. Four cells each of emf 1.5 V and internal resistance 2.0 ohm are connected in parallel. The battery of cells is connected to an external resistance of 2.5 ohm. Calculate :

(i) the total resistance of the circuit

(ii) the current flowing in the external circuit and

(iii) the drop in potential across the terminals of the cells.

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Numerical – 5. Four resistance of 2.0 Ω each are joined end to end to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent corners.

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