Advertisements
Advertisements
प्रश्न
Two resistors of resistance 2 Ω and 3 Ω are connected in parallel to a cell to draw current 0.5 A from the cell. Calculate the current in each resistor.
Advertisements
उत्तर
If i is the current through 2 Ω resistance, then (0.5 - i) is the current through 3 Ω resistance.
∴ i × 2 = (0.5 - i) × 3 ∵ p.d. is same
2i = 1.5 - 3i
2i + 3i = 1.5
5i = 1.5
i = 0.3 A
∴ current through 2 Ω resistance = 0.3 A and
current through 3 Ω resistance = 0.5 – 0.3 = 0.2 A
APPEARS IN
संबंधित प्रश्न
Which of the following arrangement, A or B, has the lower combined resistance?
Explain with the help of a labelled circuit diagram, how you will find the resistance of a combination of three resistors of resistances R1, R2 and R3 joined in parallel.
The figure given below shows three resistors?
Their combined resistance is:
(a) `1 5/7`Ω
(b) `14` Ω
(c) `6 2/3` Ω
(d) `7 1/2` Ω
A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio `R_1/R_2` is:
(a) `1/25`
(b)1/5
(c)5
(c)25
Show with the help of diagrams, how you would connect three resistors each of resistance 6 Ω, so that the combination has resistance of (i) 9 Ω (ii) 4 Ω.
What are the advantages of a parallel connection?
A given wire is stretched to double its length. How will its resistance change?
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is:
Four resistors each of resistance 5 Ω are connected in parallel. What is the effective resistance?
A particular resistance wire has a resistance of 3·0 ohm per metre. Find the resistance of 5 m length of a wire of the same material, but with twice the area of cross section.
