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Which Instrument is Used to Measure Electric Current? How Should It Be Connected in a Circuit? - Science

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प्रश्न

 Which instrument is used to measure electric current? How should it be connected in a circuit?

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उत्तर

Current is measured by an instrument called ammeter. An ammeter should be connected in series with the circuit in which the current is to be measured.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Electricity - Exercise 2

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व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6

What Makes an Electric Current Flow in a Wire?


Why should the resistance of: 

 an ammeter be very small?


If the charge on an electron is 1.6 × 1019 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?


What happens to the other bulbs in a series circuit if one bulb blows off?


 An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?


State two characteristics of a fuse wire.

Where is the main fuse in a house circuit connected?

A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.


Can a copper wire be used as a fuse wire?

Find the effective resistance in the following circuit diagrams (Fig.):


60 joules of heat was dissipated in a resistor when 20 C flowed for 5 s. Calculate:
(a) P.d. across the resistor,
(b) Resistance of the resistor, and
(c) Average power dissipated in the resistor.


Fig . shows the core of a transformer and i ts input and output connections 

State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).


A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:

The energy dissipated in the bulb in 10 minutes.


What is meant by internal resistance of a cell?


A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly


A current of 2A passing through the conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is ______.


What is the rate at which charges flow past a point on a circuit?


Calculate the current in a wire if a charge of 1500 coulomb flows through it in 5 minutes.


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