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What Makes an Electric Current Flow in a Wire? - Science

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प्रश्न

What Makes an Electric Current Flow in a Wire?

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उत्तर

The potential difference between the ends of the wire makes the current flow through the wire.

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पाठ 1: Electricity - Exercise 2

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संबंधित प्रश्‍न

Which of the following units could be used to measure electric charge?

(a) ampere
(b) joule
(c) volt
(d) coulomb


What is an Ammeter? How is It Connected in a Circuit? Draw a Diagram to Illustrate Your Answer.


In the circuit diagram  given below, three resistors R1, R2, and R3 of 5 Ω, 10 Ω and 30 Ω, respectively are connected as shown 

  

Calculate:

  1. current through each resistor.
  2. total current in the circuit. 
  3. total resistance in the circuit.

The lamps in a house hold circuit are connected in parallel because:

(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail


Which effect of current is utilised in the working of an electric fuse?


The rating of a fuse connected in the lighting circuit is:
(a) 15 A (b) 5 A (c) 10 A (d) Zero


A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:

(i) the internal resistance and (ii) e.m.f. of the cell. 


Explain the meaning of the statement 'the current rating of a fuse is 5 A'.

A switch is not touched with wet hands while putting it on or off. Give a reason for your answer.

What is international convention of colour coding in a cable?


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


Why is an ammeter always connected in series while the voltmeter always in parallel to a circuit across which voltage is to be measured?

Transformers are usually designed so that their efficiency is as close to 100% as possible. Describe two features in transformer design which help to achieve high efficiency?

Define the term kilowatt - hour and state its value in S.I. unit.


An electric bulb is rated at 220 V, 100 W.

  1. What is its resistance?
  2. What safe current can be passed through it?

An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply of the energy supplied in kWh to the three heaters in 5 hours.


How is direction of current related to the direction of flow of electrons?


Conventionally, the direction of the current is taken as:


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


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