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प्रश्न
Give one example to show how the resistance depends on the nature of material of the conductor.
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उत्तर
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संबंधित प्रश्न
Find the equivalent resistance between points A and B.
The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
If the length of a wire is doubled by taking more of wire, what happens to its resistance?
Name the material which is used for making the heating element of an electric iron.
A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:
(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor
What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?
4 Ω, 8 Ω, 12 Ω, 24 Ω
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A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
What is the equivalent resistance between A and B in the given circuit (Fig?)
Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :
- the effective resistance of the circuit.
- the reading of ammeter.
What material is used for making wire to prepare heating coils? Give a reason.
How does the resistivity of a semiconductor depend on temperature?
State expression for Resistance connected in parallel.
Calculate the equivalent resistance between P and Q from the following diagram:
Illustrate-combination of cells e.g., three cells, in series, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in them is in the ratio:
