Advertisements
Advertisements
प्रश्न
In the figure given below, A, B and C are three ammeters. The ammeter B reads 0.5A. (All the ammeters have negligible resistance.)
Calculate:
(i) the readings in the ammeters A and C.
(ii) the total resistance of the circuit.
Advertisements
उत्तर
(i) P.d. across 6 Ω = P. d. across 3 Ω
Or 6 × 0.5 = 3 × ic
Or ic i.e., current passing through the ammeter C is:
`(6 xx 0.5)/3 = 1.0`ampere
(ii) Here, `1/"R" = 1/6 + 1/3 = 3/6 = 1/2`
or R = 2 Ω
∴ Total ressistance of the circuit = 2Ω + R = 2Ω + 2Ω = 4Ω
∴ Current through A = Current passing through B + current passing through C
= 0.5 + 1.0 = 1.5 ampere
APPEARS IN
संबंधित प्रश्न
State whether the resistivity of a wire changes with the change in the thickness of the wire.
What is meant by saying that the electric potential at a point is 1 volt?
Calculate the work done in moving a charge of 4 coulombs from a point at 220 volts to another point at 230 volts.
What is Ohm's law? Explain how it is used to define the unit of resistance.
What current will be taken by a 920 W appliance if the supply voltage is 230 V?
A current of 100 mA. flows through a wire. The charge on an electron is 1.6 × 10-19 C. Find the number of electrons passing per second through the cross-section of the conductor.
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is stretched to double its length?
Define electric potential and potential difference.
A boy records that 4000 joules of work are required to transfer 10 coulombs of charge between two points of a resistor of 50 Ω. The current passing through it is:
Twenty-seven drops of the same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
