Advertisements
Advertisements
प्रश्न
In the following figure calculate:
- the total resistance of the circuit
- the value of R, and
- the current flowing in R.
Advertisements
उत्तर
(a) V = 4 V; I = 0.4 A
Total Resistance R'=?
R' = `"V"/"I" = 4/0.4` = 10 Ω
(b) R1 = 20 Ω; R' = 10 Ω
`1/"R'" = 1/"R" + 1/"R"_1`
`1/10 = 1/"R" + 1/20`
`1/"R" = 1/10 - 1/20`
`1/"R" = (2 - 1)/20`
`1/"R" = 1/20`
R = 20 Ω
(c) R = 20 ohm; V = 4 V
I = `"V"/"R" = 4/20` = 0.2 A
APPEARS IN
संबंधित प्रश्न
Differentiate between resistances in series and parallel.
Complete the following :-
(c)
Which of the following arrangement, A or B, has the lower combined resistance?
State how are the two resistors joined with a battery when equivalent resistance is less than either of the two resistances.
A particular resistance wire has a resistance of 3 ohm per meter. Find the total resistance of three lengths of this wire each 1.5 m long, joined in parallel.
Show how would you connect three resistors, each of resistance 6 O so that
the combination has a resistance of(a) 9 Ω (b) 4 .Ω
Explain, why is the p.d. between the terminals of a storage battery less when it is supplying current than when it is on open circuit. A battery of e.m.f. 10 volts and internal resistance 2.5 ohms has two resistances of 50 ohms each connected to it. Calculate the power dissipated in each resistance
(a) When they are in series,
(b) When they are in parallel.
In each case calculate the power dissipated in the battery.
Calculate equivalent resistance in the following cases:
The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is:
You are given four ammeters A, B, C and D having the least counts mentioned below:
(I) Ammeter A with least count 0.25 A
(II) Ammeter B with least count 0.5 A
(III) Ammeter C with least count 0.05 A
(IV) Ammeter D with least count 0.1 A
Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistances most accurately, when connected in parallel?
