Advertisements
Advertisements
प्रश्न
What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?
Advertisements
उत्तर
Connecting a 2 Ω and 6 Ω resistor in series combination:
`R=R_1+R_2`
R= 2Ω+6Ω=8Ω
Thus, we will get an 8 Ω resistor
Connecting a 2 Ω and 6 Ω resistor in parallel combination:
`1/R=1/R_1+1/R_2`
`1/R=1/2+1/6`
⇒`1/R=4/6`
⇒ `R=6/4 `Ω
Thus, we will get a 1.5 Ω resistor.
APPEARS IN
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
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
How does the resistance of a pure metal change if its temperature decreases?
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
How does the resistance of a wire change when:
its diameter is tripled?
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.
What is the equivalent resistance between A and B in the given circuit (Fig?)

You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be ______.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
State expression for Resistance connected in series.
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.
What is the equivalent resistance between the points X and Y for the given network?
A metal wire of resistance 6 Ω is stretched so that its length is increased to twice its original length. Calculate its new resistance.
The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two resistances.
When a 4 Ω resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is:
