Advertisements
Advertisements
प्रश्न
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
Advertisements
उत्तर
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.
संबंधित प्रश्न
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
If the length of a wire is doubled by taking more of wire, what happens to its resistance?
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
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?
How will you oonnect five resistors, each of the value one ohm, to obtain an equivalent resistance of 0.2 `Omega`
What do you mean by power rating of an electrical appliance? How do you use it to calculate
(a) the resistance of the appliance and
(b) the safe limit of the current in it, while in use?
To increase the effective resistance in a circuit, the resistors are connected in _______________ .
How does the resistance of an alloy, vary with temperature?
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.
What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)
