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प्रश्न
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उत्तर
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संबंधित प्रश्न
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?
When do you say that the resistors are connected in this way? Draw a circuit diagram.
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
How does the resistivity of a semiconductor depend on temperature?
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.
