{"id":4085,"date":"2023-10-06T09:31:25","date_gmt":"2023-10-06T09:31:25","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=4085"},"modified":"2023-10-06T09:38:59","modified_gmt":"2023-10-06T09:38:59","slug":"week-1-ss3-second-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-1-ss3-second-term-physics-notes\/","title":{"rendered":"Week 1 – SS3 Second Term Physics Notes"},"content":{"rendered":"

SECOND TERM E-LEARNING NOTE
\n<\/strong>
\n\u00a0SUBJECT: PHYSICS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0CLASS: SS 3
\n<\/strong>
\n\u00a0SCHEME OF WORK
\n<\/strong>
\n\u00a0WEEK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TOPIC
\n<\/strong><\/p>\n

    \n
  1. Alternating Current (I)\n<\/li>\n
  2. Alternating Current (II)\n<\/li>\n
  3. Models of the Atom\n<\/li>\n
  4. Radioactivity (I)\n<\/li>\n
  5. Radioactivity (2)\n<\/li>\n
  6. Energy Quantization\n<\/li>\n
  7. Photo-Electricity (x-ray)\n<\/li>\n
  8. Conduction of Electricity in gases.\n<\/li>\n
  9. Wave- Particle Paradox\n<\/li>\n<\/ol>\n
      \n
    1. \n
      Rockets and Satellites; Component parts and functions Basic Electronics;\n<\/div>\n

      \u00a0\u00a0\u00a0\u00a0Semiconductors.\n<\/li>\n<\/ol>\n

      \u00a0REFERENCE TEXTBOOKS AND PAST QUESTIONS
      \n<\/strong><\/p>\n

        \n
      • New School Physics by Prof. M.W Anyakoha.\n<\/li>\n
      • New System Physics by Dr. Chow.et.al\n<\/li>\n
      • WAEC past Questions pack\n<\/li>\n
      • UTME past Question pack\n<\/li>\n
      • MASTERS Physics Practical Manual.\n<\/li>\n<\/ul>\n

        \u00a0
        \n\u00a0WEEK ONE
        \n<\/strong>TOPIC: ALTERNATING CURRENT(I)
        \n<\/strong>CONTENT
        \n<\/strong><\/p>\n

          \n
        • Alternating Current Circuit\n<\/li>\n
        • Graphical Representation\n<\/li>\n
        • Peak and R.M.S. Values\n<\/li>\n<\/ul>\n

          \u00a0A.C circuits are circuits through which an alternating current flows. Such circuits are used extensively in power transmission, radio and television, computer technology, telecommunication and in medicine. It varies sinusoid ally or periodically, in such a way as to reverse its direction periodically. The commonest form of such a.c can be represented by;
          \n\u00a0\u00a0\u00a0\u00a0I = Io sin 2\u03c0 ft\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 1
          \n\u00a0\u00a0\u00a0\u00a0= Io sin wt
          \nI is the instantaneous current at a time t, Io is the maximum ( or peak ) value of current or its amplitude; f is the frequency and w = ( 2\u03c0 ft) us the angular velocity, (wt) is the phase angle of the current
          \nAlso,
          \n\u00a0\u00a0\u00a0\u00a0V = Vo<\/sub> sin 2 \u03c0 ft\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026..2
          \n \u00a0\u00a0\u00a0\u00a0= Vo<\/sub> sin wt
          \nExamples
          \nIf an a.c voltage is represented by 1f
          \nV = 4 sin 900 \u03c0t, calculate the peak and instantaneous voltage
          \nThe peak voltage, Vo = 4v
          \n\u00a0\u00a0\u00a0\u00a02\u03c0ft = 900\u03c0t
          \n\u00a0\u00a0\u00a0\u00a0f = 900
          \n 2
          \n\u00a0\u00a0\u00a0\u00a0f = 450Hz
          \n w = 2\u03c0f = 900\u03c0
          \nPeak, and r.m.s. values of a.c <\/p>\n

          \u00a0EVALUATION<\/strong><\/p>\n

            \n
          1. Differentiate between peak and r.m.s voltage.\n<\/li>\n
          2. Calculate the peak and instantaneous voltage of an a.c source represented by; V = 5 sin 500\u220ft.\n<\/li>\n<\/ol>\n

            \u00a0Variation of alternating current (or voltage) with time
            \n<\/strong>An alternating current ( or voltage) varies sinusoidally as shown in the diagram above. It is a sine waveform. The amplitude or peak value of the current Io is the maximum numerical value fo the current.<\/p>\n

            \u00a0The root mean square (r.m.s) value of the current is the effective value of the the current . it is that steady current which will develop the same quantity of heat in the same time in the same resistance.
            \nThe r.m.s. value for the current is given by:
            \nIr.m.s<\/sub>. = Io<\/sub>
            \n\t\t \u221a2 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026. 3
            \nThe moving iron and hot wire meters measure the average value of the square of the current called the mean-square current. They are however calibrated in such a way as to indicate the r.m.s. current directly. This most a.c meters read the effective or r.m.s. values. The average value of an a.c voltage is zero.<\/p>\n

            \u00a0GENERAL EVALUATION<\/strong><\/p>\n

              \n
            1. \n

              Differentiate between heat and temperature.
              \n<\/h3>\n<\/li>\n
            2. Mention five effect of heat.\n<\/li>\n<\/ol>\n

              \u00a0
              \n\u00a0READING ASSIGNMENT
              \n<\/strong>New School Physics p 447 -457<\/p>\n

              \u00a0WEEKEND ASSIGNMENT
              \n<\/strong><\/p>\n

                \n
              1. A 50Hz a.c circuit has a voltage of 220V and a current of 5.0A as its effective value. Determine the peak values of the voltage and its current. (a)311.0V and 1.71A (b) 331.0V and 7.10A (c) 311.00V and 7.10A(d)7.10V and 311.00A\n<\/li>\n
              2. Calculate the peak voltage of a mains supply of r.m.s value of 220V. (a)112V (b) 150V (c) 222V (d) 311V\n<\/li>\n
              3. In an ac circuit the peak value of the potential difference is 180V. what is the instantaneous potential differences when the phase angle is 45o<\/sup>. (a)45V (b) 90V (c) 90\u221a2 V (d)180V\n<\/li>\n
              4. An ammeter connected to an a.c circuit records 5.5A. What is the peak value of the current? (a) 7.8\u00a0\u00a0\u00a0\u00a0(b) 7.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(c) 3.9\u00a0\u00a0\u00a0\u00a0(d) 3.\n<\/li>\n
              5. \n
                When compared, the r.m.s value is ………. the peak value.(a) greater than(b) same(c) lower than (d) inversely proportional to.\n<\/div>\n

                \u00a0<\/li>\n<\/ol>\n

                THEORY<\/strong><\/p>\n

                  \n
                1. Distinguish between alternating current (a.c) and direct current (d.c). Explainthe term peak value and r.m.s. value as they apply to a.c circuit\n<\/li>\n
                2. Draw a wave from diagram for an a.c and label the points at which the current is zero and maximum respectively. Determine the effective value of an a\/c if its peak value is 15A.\n<\/li>\n<\/ol>\n

                  \u00a0
                  \n\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

                  SECOND TERM E-LEARNING NOTE \u00a0SUBJECT: PHYSICS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0CLASS: SS 3 \u00a0SCHEME OF WORK \u00a0WEEK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TOPIC Alternating Current (I)…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,317],"tags":[],"class_list":["post-4085","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-ss3-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4085","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=4085"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4085\/revisions"}],"predecessor-version":[{"id":4086,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/4085\/revisions\/4086"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=4085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=4085"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=4085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}