{"id":2671,"date":"2023-10-03T11:33:20","date_gmt":"2023-10-03T11:33:20","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=2671"},"modified":"2023-10-03T11:38:43","modified_gmt":"2023-10-03T11:38:43","slug":"week-1-ss1-third-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-1-ss1-third-term-physics-notes\/","title":{"rendered":"Week 1 – SS1 Third Term Physics Notes"},"content":{"rendered":"

THIRD TERM E-LEARNING NOTE<\/strong><\/p>\n

\t\tTHIRD TERM SCHEME OF WORK
\n<\/strong>1 Electric Circuit (DC).
\n2 Resistors and Cells in Series and Parallel.
\n3. Electrical Energy and Power
\n4. Safety Device – Fuse
\n5. Atomic Structure, Diffusion and Osmosis
\n6. Crystal Structure of Matter \u2013 Amorphous and Crystalline Substances
\n7. Surface Tension
\n8. Capillarity
\n9 Elasticity
\n10. Energy Stored in an Elastic Material
\n11. Revision
\n12. Examination<\/p>\n

\u00a0
\n\t\tWEEK 1
\n<\/strong>
\n\t\tTOPIC: ELECTRIC CIRCUIT
\n<\/strong>
\n\t\tCONTENT<\/strong>: Definition and functions of electric circuit and its components
\n Definition of some physical quantities in dc circuit
\n Verification of ohm’s law<\/p>\n

\u00a0 Before explaining electric circuit, let us define some terms<\/p>\n

    \n
  1. Conductors: They are materials which allow electrons to pass through them easily e.g. metal, graphite, acids, salt solution etc.\n<\/li>\n<\/ol>\n

    2. Semi conductors: They are materials whose resistivities is mid way between
    \n good conductors and insulators e.g. germanium, silicon etc
    \n3. Insulators: They are materials which do not allow electrons to pass through
    \n them e.g. paper, plastic, glass, oil, cotton, dry hair, polythene etc <\/p>\n

    \u00a0
    \n\t\t\tElectric Circuit<\/strong> : An electric circuit is a complete path provided for the flow of electric current. The circuit diagram below is a symbolic representation of such circuit.
    \nFunctions of dc circuit components
    \n<\/strong><\/p>\n

      \n
    • cells are chemical devices which produces electric force\/pressure that pushes the current to flow.\n<\/li>\n
    • Switch \/ key is a device used to start or stop the current flow.\n<\/li>\n
    • Ammeter measures the electric current flowing in a circuit\n<\/li>\n
    • Voltmeter measures the potential difference across the terminal of a load\n<\/li>\n
    • Rheostat varies the flow of current\n<\/li>\n
    • Resistor is a component that limits or regulate the flow of electric current\n<\/li>\n<\/ul>\n

      EVALUATION
      \n<\/strong><\/p>\n

        \n
      1. Define electric circuit\n<\/li>\n
      2. State the functions of the components that make up a circuit\n<\/li>\n<\/ol>\n

        Definitions of some physical quantities
        \n<\/strong>Electric Current (I): it is the measure of the rate of movement (flow) of charged particles along an electrical conductor (a circuit). It is simple electric charge (Q) in motion which consists of moving electrons.
        \nI = Q\/t ____________ (1a) where t \u2013 time (s)
        \nQ = It \u2026\u2026\u2026\u2026\u2026\u2026 (1b)<\/p>\n

        \u00a0Potential Difference (V): Potential difference between two points in a circuit is the work done (W) when one coulomb of charge moves from one point to another.
        \nW = Q (VB \u2013 VA) = QV ____________ (2a)
        \nV = W\/Q \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(2b)
        \nElectromotive Force (E): E.M.F of a cell is the p.d between the terminals of the cell when it is not delivering any current to the circuit.<\/p>\n

        \u00a0Internal Resistance (r): r of a cell is the resistance offered by the electrolyte to the motion of the current.<\/p>\n

        \u00a0Resistance (R): R is the ratio of the p.d across the conductor to the current flowing through it.
        \nOhm’s Law
        \n\t\t<\/strong>Ohm’s law states that the electric current in a given metallic conductor is directly proportional to the potential difference applied provided that the temperature and other physical factors remain constant i.e V \u03b1 I<\/p>\n

        \t\tVerification of ohm’s law.
        \n<\/strong>Aim: To show that metallic\/ohmic conductor obey ohm’s law
        \nApparatus: voltmeter, ammeter, rheostat, battery, key, pieces of wire and ohmic conductor x
        \nProcedure: set up the apparatus as shown above
        \nObservation: As the rheostat is been varied, the reading of the voltmeter is also changing. Also, the current in the ammeter is increasing with increase in potential difference.
        \nSlope = \u2206V\/ \u2206I = R
        \nWhere R is the constant of proportionality and it is called resistance (R)
        \nConclusion: ohmic conductors obey ohm’s law.
        \n i.e.\u00a0\u00a0\u00a0\u00a0 V = IR______________ 3(a)
        \n\u00a0\u00a0\u00a0\u00a0 I = V\/R_____________ 3(b)
        \n R= V\/I _____________ 3(c)
        \nNB : The relationship between I, E, R & r is that
        \nI = E \/ R + r = V\/R \u2026\u2026\u2026\u2026\u20264
        \nEVALUATION
        \n<\/strong>1. Define the following terms (a) Electric current (b) Potential difference (c) Internal resistance
        \n2. Describe an experiment to verify ohm’s law
        \nReading Assignment<\/strong> : Read more on electric circuit \u2013 New school physics (pg 77 – 80)<\/p>\n

        \t\tWEEKEND ASSIGNMENT
        \n<\/strong><\/p>\n

          \n
        1. The SI unit of electric current is (a) ampere (b) volts (c) ohm’s (d) coulomb\n<\/li>\n
        2. The SI unit of electric charge is (a) ampere (b) volts (c) ohm’s (d) coulomb\n<\/li>\n
        3. The SI unit of potential difference is (a) ampere (b) volts (c) ohm’s (d) coulomb\n<\/li>\n
        4. The SI unit of resistance is (a) ampere (b) volts (c) ohm’s (d) coulomb\n<\/li>\n
        5. Ohm’s law states that (a) V=IR (b) Q=It (c) R=IV (d) W=QV\n<\/li>\n<\/ol>\n

          \t\tTHEORY
          \n<\/strong>1. Define the following terms (a) Electric current (b) Potential difference (c) Internal resistance
          \n2. Describe an experiment to verify ohm’s law<\/p>\n","protected":false},"excerpt":{"rendered":"

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