Advertisements
Advertisements
प्रश्न
You are supplied with a number of 100 Ω resistors. How could you combine some of these resistors to make a 250 Ω resistor?
Advertisements
उत्तर
When two 100 Ω resistors are connected in parallel, the value of the combined resistance becomes 50 Ω.
Now to get a resistance of 250 Ω, we must connect two more 100 Ω resistors in series with the above combination.
Therefore, the configuration will be two 100 Ω resistors in series with a parallel combination of another two 100 Ω resistors.
APPEARS IN
संबंधित प्रश्न
Why is the series arrangement not used for domestic circuits?
Write any two characteristics of a series combination of resistors.
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
Calculate the combined resistance in the given case:
![]()
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
When do you say that the resistors are connected in this way? Draw a circuit diagram.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
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?
You are provided with three resistors of resistance 1.0 Ω, 2.0 Ω and 3.0 Ω How would you connect them to obtain the total effective resistance 1.5 Ω? Draw diagram of the arrangement and check it by calculations.
Calculate the equivalent resistance between the points A and B for the following combination of resistors:
Three resistors of 6Ω, 3Ω and 2Ω are connected together so that their total resistance is greater than 6Ω but less than 8Ω Draw a diagram to show this arrangement and calculate its total resistance.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.
