Advertisements
Advertisements
प्रश्न
In the diagram shown below, the cell and the ammeter both have negligible resistance. The resistor are identical.
Advertisements
उत्तर
Let V be the voltage of the cell and R is the resistance of each resistor. When switch K is not closed then
\[\frac{V}{\frac{R}{2}} = 0 . 6 . . . . . (1) [\text{ Using V = I }R]\]
\[\text{ Let A be the current, when switch (K) is closed } \]
\[\frac{V}{\frac{R}{3}} = A . . . . . (2)\]
\[\text{ Dividing equation (2) by (1), we get }\]
\[\frac{A}{0 . 6} = 1 . 5\]
\[ A = 1 . 5 \times 0 . 6 = 0 . 9 A\]
APPEARS IN
संबंधित प्रश्न
Differentiate between resistances in series and parallel.
Several electric bulbs designed to be used on a 220 V electric supply line are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Find the current in each resistor in the circuit shown below:
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.
State how are the two resistors joined with a battery when equivalent resistance is less than either of the two resistances.
You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is less than 1Ω? Draw diagram and find the total resistance.
A battery of e.m.f 16 V and internal resistance 2 Ω is connected to two resistors 3Ω and 6Ω connected in parallel. Find:
- the current through the battery.
- p.d. between the terminals of the battery,
- the current in 3 Ω resistors,
- the current in 6 Ω resistor.
What is the equivalent resistance of 5 equal resistors, each of value 2`Omega` 1 when oonnected in (a) Series ( b) ParaIleI?
The equivalent resistance of a parallel combination of two resistors of 30 Ω and 60 Ω is ______________.
How does the resistance of a metallic wire depend on the length of wire?
The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is:
A coil in the heater consumes power P on passing current. If it is cut into halves and joined in parallel, it will consume power:
Assertion: When a battery is short circuited, the terminal voltage is zero.
Reason: In a short circuit, the current is zero.
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?
A piece of wire of resistance R is cut into three equal parts. These parts are then connected in parallel. If the equivalent resistance of this parallel combination is R1, what is the value of the ratio R1 : R?
