Advertisements
Advertisements
Question
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
Advertisements
Solution
Bends in the wire will not affect its resistance. This is because the electrons are extremely small in size as compared to the bends. So, the electrons can easily change their direction of motion.
RELATED QUESTIONS
How does the presence of impurities in a metal affect its resistance?
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
Name a substance of which the resistance remains almost unchanged by the increase in temperature.
State how are the two resistors joined with a battery when same current flows in each resistor.
Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
