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प्रश्न
A cell of e.m.f 2.0 V and internal resistance 1Ω is connected to the resistors of 3Ω and 6Ω in series. Calculate:
(i) the current drawn from the cell,
(ii) the p.d. across each resistor,
(iii) the terminal voltage of the cell and
(iv) the voltage drop.
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उत्तर
Total resistance of the circuit R = 1 + 3 + 6 = 10 Ω
(i) The current drawn from the cell = `"E"/"R" = 2.0/10 = 0.2` A
(ii) The p.d. across 3 Ω resistor V1 = IR1 = 0.2 × 3 = 0.6V
The p.d. across 6 Ω resistor V2 = IR2 = 0.2 × 6 = 1.2 V
(iii) The terminal voltage of the cell V = V1 + V2
= 0.6 + 1.2 = 1.8 V
(iv) The voltage drop = E - V = 2.0 - 1.8 = 0.2 V
संबंधित प्रश्न
Name a device that helps to maintain a potential difference across a conductor.
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
What do you understand by the term "potential difference"?
Calculate the current flowing through each of the resistors A and B in the circuit shown in the following figure.
Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
A V-I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.
From the following observations taken while determining the resistance of a conductor, draw the current-voltage graph and calculate the resistance of conductor. Is the conductor ohmic?
| Ammeter reading I (in ampere) | Voltmeter reading V (in volt) |
| 0.2 | 0.4 |
| 0.3 | 0.6 |
| 0.5 | 1.0 |
| 0.8 | 1.6 |
| 1.5 | 3.0 |
Exercise.
Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb drawing a current of 2.5 A.
Name a device that helps to maintain a potential difference across conductors.
Find the potential difference required to flow a current of 300 mA in a wire of resistance 20 Ω.
