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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.
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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
संबंधित प्रश्न
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
Calculate the work done in moving a charge of 4 coulombs from a point at 220 volts to another point at 230 volts.
How is a voltmeter connected in the circuit to measure the potential difference between two points? Explain with the help of a diagram.
Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?
What is the ratio of potential difference and current known as?
In the circuit shown below:
The potential difference across the 3 Ω resistor is:
State the S.I. unit of electric potential.
Write proper word from the following group of words in the blank.
(magnetism, 4.5V, 3.0V, gravitational attraction, potential difference, potential, higher, lower, 0V)
Water in the waterfall flows from a higher level to the lower level because of ______.
Exercise.
Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb drawing a current of 2.5 A.
Assertion (A): Charges flow from higher potential to lower potential.
Reason (R): Current flows mainly due to the flow of electrons.
