Advertisements
Advertisements
Question
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
Solution
(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
RELATED QUESTIONS
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 5 C passes through it?
What is the combined resistance of each of the networks between A and B shown in fig. ?
The voltage across a 3Ω resistance is 6 V. How large is the current? What is
the resistance of a filament lamp when a voltage of 3 V across it causes a
current of 0.5 A?
What do you understand by the resistance of a wire?
Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor. How can you find the resistance of the resistor from this graph?
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
______ is work done per unit charge.
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2 ) is ______
What does the positive and negative sign of potential convey?
