Advertisements
Advertisements
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
उत्तर
(a) Series.
The effective resistance in series is the sum of individual resistances. So, the resistances should be connected in series in order to increase the effective
resistance.
APPEARS IN
संबंधित प्रश्न
Complete the following :-
(a)
Write any two characteristics of a series combination of resistors.
Find the equivalent resistance between points A and B.
Find the equivalent resistance between points A and B
(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.
(ii) Why do we prefer arrangements of Set B for house circuiting?
Find the equivalent resistance between A and B
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.
The diagram below shows part of a circuit:
If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω
You are supplied with a number of 100 Ω resistors. How could you combine some of these resistors to make a 250 Ω resistor?
State how are the two resistors joined with a battery when same current flows in each resistor.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
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?
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
How does the resistance of an alloy, vary with temperature?
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
A metal wire of resistance 6 Ω is stretched so that its length is increased to twice its original length. Calculate its new resistance.