Advertisements
Advertisements
प्रश्न
Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.

Advertisements
उत्तर
r1 = r2 = r3 = r4 = 2 Ω
Both r1 and r2 are connected in series in the figure.
Total resistance in series R1 = r1 + r2
= 2 + 2
= 4 Ω
r3 and r4 are in parallel `1/"R" = 1/r_1 + 1/r_2`
= `1/2 + 1/2 = 1`
R2 = 1 Ω
Total resistance R1 + R2 = 4 + 1 = 5 Ω
APPEARS IN
संबंधित प्रश्न
Show how you would connect two 4 ohm resistors to produce a combined resistance of (a) 2 ohms (b) 8 ohms.
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.
State how are the two resistors joined with a battery when equivalent resistance is less than either of the two resistances.
State how are the two resistors joined with a battery when potential difference is same across each resistor.
Four resistors each of resistance 2Ω are connected in parallel. What is the effective resistance?
What is the equivalent resistance of 5 equal resistors, each of value 2`Omega` 1 when oonnected in (a) Series ( b) ParaIleI?
The circuit diagram Fig shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f. 2 V and internal resistance 3 Ω. If main current of 0.25 A flows through the circuit, find:

- the p.d. across the 4 Ω resistor,
- the p.d. across the internal resistance of the cell,
- the p.d. across the R Ω or 2 Ω resistors
- the value of R.
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:
Two V-I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows (a) series, (b) parallel combination of the resistors.

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.
