{"id":21310,"date":"2024-02-29T16:28:28","date_gmt":"2024-02-29T10:58:28","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=21310"},"modified":"2024-03-01T09:17:14","modified_gmt":"2024-03-01T03:47:14","slug":"selina-concise-physics-class-8-icse-solutions-electricity","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/selina-concise-physics-class-8-icse-solutions-electricity\/","title":{"rendered":"Selina Concise Physics Class 8 ICSE Solutions – Electricity"},"content":{"rendered":"

Selina Concise Physics Class 8 ICSE Solutions – Electricity
\n<\/strong><\/span><\/h2>\n

ICSE Solutions \u00a0<\/a>Selina ICSE Solutions \u00a0<\/a>ML Aggarwal Solutions<\/a><\/p>\n

ICSESolutions.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 8 Electricity. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers Concise Physics for Class 8 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n

Selina Class 8 Physics ICSE Solutions<\/a>Chemistry<\/a>Biology<\/a>Maths<\/a>Geography<\/a>History & Civics<\/a><\/p>\n

Selina Concise ICSE Solutions for Class 8 Physics Chapter 8\u00a0 Electricity
\n<\/strong><\/span><\/h2>\n
    \n
  • \u00a0ELECTRICITY: \u201cIs the rate of flow of electrons\u201d. i = \\(\\overset { q }{ \\underset { t }{ – } } \\)<\/li>\n
  • \u00a0To keep electrons move, potential difference is needed. This is done by a cell or battery.<\/li>\n
  • \u00a0Potential difference \u201cis the amount of work done in moving a unit positive charge from one point to other.\u201d
    \nPotential difference V =\u00a0Work done (W) \/ charge moved (Q)
    \nOr W = QV but charge = it
    \nHence, W = VIt or Electrical energy = VIt<\/li>\n
  • \u00a0Power is \u201cRate of doing work\u201d
    \nP = W\/t = VIt\/t = VI
    \nPower is measured in watt or J\u00a0S-1<\/sup>
    \n1 Watt = 1 Volt \u00d7 1 Ampere<\/li>\n
  • S.I. unit of charge is coulomb (C).
    \nS.I. unit of current is Ampere (A).
    \nS.I. unit of P.D. is volt.
    \nS.I. unit of electrical energy is Joule (J) and of power is watt (W)
    \n1 kWh-3600000J = 3.6 x\u00a0106<\/sup> J<\/li>\n
  • \u00a0ELECTRIC power is generated at the GENERATING STATION at 11000 volt, or 11 kV as these stations are at very far off place from areas where it is to be used. The voltage (A.C.) is of 50 HZ frequency.<\/li>\n
  • AT GRID SUB-STATION this alternating current (A.C) voltage is stepped up from 11 kV to 132 kV to minise the loss of energy in transmission line wires.<\/li>\n
  • At MAIN-SUB-STATION this voltage is stepped down from 132 kV to 33 kV and transmitted to city SUB-STATION.<\/li>\n
  • \u00a0At CITY SUB STATION, it is further stepped down from 33 kV to 220 V for supply to hourses for consumers.<\/li>\n
  • \u00a0Colour coding: Live wire \u2014 Red or Brown
    \nNeutral\u2014Black or light blue
    \nEarth wire \u2014 Green or yellow<\/li>\n
  • \u00a01 kWh = 1 unit: Power Rating on an appliance 100 W – 220 V means the appliance when worked on a 220 V will consume 100 W electricity power<\/li>\n
  • OVER LOADING: is the condition of Electric circuit, when it draws more current than it is designed for i. e. when a number of appliances are switched on at a time i.e. geyser, A.C. Electric motor etc. or a large number of plugs are put in the same socket.<\/li>\n
  • \u00a0EARTHING: is done in a house near the kWh meter. Earthing is a safety device which puts the appliance at zero potential.<\/li>\n
  • \u00a0SHORT CIRCUITING: If the insulation on the wire of cable used f in the wiring (or used with an appliance) breaks. The LIVE WIRE
    \nCOMES IN CONTACT WITH THE NEUTRAL WIRE, this result in SHORT CIRCUITING<\/li>\n
  • \u00a0FUSE: \u201cIs a device used to limit the current in an electric circuit\u201d. The use of fuse protects the appliance in circuit from being damaged Fuse is always connected in live wire. A fuse wire should have
    \n(i) High resistance
    \n(ii) Low melting point.
    \nThese days miniature circuit breakers (MCB) are used. It is AUTOMATIC breaker, when current flowing excess.<\/li>\n
  • \u00a0Appliances in a house are connected in parallel.<\/li>\n<\/ul>\n

    Test yourself<\/strong><\/span><\/p>\n

    A. Objective Questions<\/span><\/p>\n

    1. Write true or false for each statement:<\/strong><\/p>\n

    (a)<\/strong> A fuse wire has a high melting point.
    \nAnswer.<\/strong> False.<\/p>\n

    (b)<\/strong> Flow of protons constitutes electric current.
    \nAnswer.<\/strong> False.<\/p>\n

    (c)<\/strong> Silver is an insulator of electricity.
    \nAnswer.<\/strong> False.<\/p>\n

    (d)<\/strong> S.I. unit and commercial unit of electrical energy are same.
    \nAnswer.<\/strong> False.<\/p>\n

    (e)<\/strong> Overloading of electric current in circuits can lead to short circuiting.
    \nAnswer.<\/strong> True.<\/p>\n

    (f)<\/strong> Our body can pass electricity through it.
    \nAnswer.<\/strong> True.<\/p>\n

    (g)<\/strong> All metals are insulators of electricity.
    \nAnswer.<\/strong> False.<\/p>\n

    (h)<\/strong> The earth wire protects us from an electric shock.
    \nAnswer.<\/strong> True.<\/p>\n

    (i)<\/strong> A switch should not be touched with wet hands.
    \nAnswer.<\/strong> True.<\/p>\n

    (j)<\/strong> AH electrical appliances in a household circuit work at the same voltage.
    \nAnswer.<\/strong> True.<\/p>\n

    (k)<\/strong> In a cable, the green wire is the live wire.
    \nAnswer.<\/strong> False.<\/p>\n

    (l)<\/strong> A fuse is connected to the live wire.
    \nAnswer.<\/strong> True.<\/p>\n

    (m)<\/strong> A switch is connected to the neutral wire.
    \nAnswer.<\/strong> False.<\/p>\n

    2. Fill in the blanks<\/strong><\/p>\n

    (a)<\/strong> The unit in which we pay the cost of electricity is kWh.<\/strong>
    \n(b)<\/strong> The electrical energy consumed in a house is measured by kWh meter.<\/strong>
    \n(c)<\/strong> In a household electrical circuit, the appliance are connected in parallel<\/strong> with the mains.
    \n(d)<\/strong> A switch is connected to the live<\/strong> wire.
    \n(e)<\/strong> The red colour insulated wire in a cable is the live<\/strong> wire.
    \n(f)<\/strong> One kilowatt hour is equal to 3.6 x 106<\/strong> joule.
    \n(g)<\/strong> A fuse wire should have low melting point.<\/strong><\/p>\n

    3. Match the following
    \n\"Selina
    \n<\/strong>
    \n\"Selina<\/p>\n

    4. Select the correct alternative<\/strong><\/p>\n

    (a)<\/strong> All wires used in electric circuits should be covered with<\/p>\n

      \n
    1. \u00a0colouring material<\/li>\n
    2. \u00a0conducting material<\/li>\n
    3. \u00a0an insulating material<\/strong><\/li>\n
    4. \u00a0none of the above<\/li>\n<\/ol>\n

      (b)<\/strong> Electric work done per unit time is<\/p>\n

        \n
      1. \u00a0electrical energy<\/li>\n
      2. \u00a0electric current<\/li>\n
      3. \u00a0electric voltage<\/li>\n
      4. \u00a0electrical power<\/strong><\/li>\n<\/ol>\n

        (c)<\/strong> One kilowatt \u00a1s equal to<\/p>\n

          \n
        1. \u00a0100 watt<\/li>\n
        2. \u00a01000 watt<\/strong><\/li>\n
        3. \u00a010 watt<\/li>\n
        4. \u00a0none of these<\/li>\n<\/ol>\n

          (d)<\/strong> Fuse wire is an alloy of<\/p>\n

            \n
          1. \u00a0tin-lead<\/strong><\/li>\n
          2. \u00a0copper-lead<\/li>\n
          3. \u00a0tin-copper<\/li>\n
          4. \u00a0lead-silver<\/li>\n<\/ol>\n

            (e)<\/strong> A fuse wire should have<\/p>\n

              \n
            1. \u00a0a low melting point<\/strong><\/li>\n
            2. \u00a0high melting point<\/li>\n
            3. \u00a0very high melting point<\/li>\n
            4. \u00a0none of the above<\/li>\n<\/ol>\n

              (f)<\/strong> When switch of an electric appliance is put off, it disconnects<\/p>\n

                \n
              1. \u00a0the live wire<\/strong><\/li>\n
              2. \u00a0the neutral wire<\/li>\n
              3. \u00a0the earth wire<\/li>\n
              4. \u00a0the live and the neutral wire<\/li>\n<\/ol>\n

                (g)<\/strong> The purpose of an electric meter in a house is<\/p>\n

                  \n
                1. \u00a0to give the cost of electricity directly<\/li>\n
                2. \u00a0to give the consumption of electrical energy<\/strong><\/li>\n
                3. \u00a0to safeguard the circuit from short circuiting<\/li>\n
                4. \u00a0to put on or off the mains.<\/li>\n<\/ol>\n

                  (h)<\/strong> If out of the two lighted bulbs in a room, one bulb suddenly fuses, then<\/p>\n

                    \n
                  1. \u00a0other bulb will glow more<\/li>\n
                  2. \u00a0other bulb will glow less<\/li>\n
                  3. \u00a0other bulb will also fuse<\/li>\n
                  4. \u00a0other bulb will remain lighted unaffected.<\/strong><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                    Selina Concise Physics Class 8 ICSE Solutions – Electricity ICSE Solutions \u00a0Selina ICSE Solutions \u00a0ML Aggarwal Solutions ICSESolutions.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 8 Electricity. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers Concise …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21310"}],"collection":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/comments?post=21310"}],"version-history":[{"count":1,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21310\/revisions"}],"predecessor-version":[{"id":168017,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21310\/revisions\/168017"}],"wp:attachment":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/media?parent=21310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/categories?post=21310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/tags?post=21310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}