{"id":2673,"date":"2023-10-03T11:33:51","date_gmt":"2023-10-03T11:33:51","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=2673"},"modified":"2023-10-03T11:38:43","modified_gmt":"2023-10-03T11:38:43","slug":"week-2-and-3-ss1-third-term-physics-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-2-and-3-ss1-third-term-physics-notes\/","title":{"rendered":"Week 2 and 3 &#8211; SS1 Third Term Physics Notes"},"content":{"rendered":"<p>\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\t\t<strong>WEEK 2<br \/>\n<\/strong><strong>TOPIC<\/strong>: <strong>RESISTORS &amp; CELLS  CONNECTED IN SERIES &amp; PARALLEL<\/strong><br \/>\n\t<strong>CONTENT<\/strong>: Resistors in series and parallel<br \/>\n\u00a0\u00a0\u00a0\u00a0                Cells in series and parallels<br \/>\n\u00a0\u00a0\u00a0\u00a0                Calculations<br \/>\n<strong>Resistors in series<\/strong>: These are end to end connection.<\/p>\n<p>\u00a0<br \/>\n\u00a0Characteristics<\/p>\n<ul>\n<li>Same current flow through each resistor\n<\/li>\n<li>Potential difference across each resistor is different\n<\/li>\n<li>P.d are additive\n<\/li>\n<li>Power are additive\n<\/li>\n<li>Applied voltage equals the sum of different p.d\n<\/li>\n<li>Resistance are additive.\n<\/li>\n<\/ul>\n<p>R<sub>T<\/sub> = R<sub>1<\/sub> + R<sub>2 <\/sub>+ R<sub>3<\/sub> _______ for 3 resistors<br \/>\nR<sub>T<\/sub> = R<sub>1<\/sub> + R<sub>2<\/sub> + R<sub>3<\/sub>\u2026.. + Rn ___ for n numbers or resistors<\/p>\n<p>\u00a0<strong>Resistors in parallel<\/strong>: These are side by side connection.<\/p>\n<p>\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\u00a0Characteristics<\/p>\n<ul>\n<li>Different resistors have their individual current\n<\/li>\n<li>P.d across each resistor is the same\n<\/li>\n<li>Branch current are additive\n<\/li>\n<li>Conductance are additive\n<\/li>\n<li>Power are additive\n<\/li>\n<\/ul>\n<p>1\/R<sub>T<\/sub> = 1\/R<sub>1<\/sub> + 1\/R<sub>2<\/sub> + 1\/R<sub>3<\/sub> ____ for 3 resistors<br \/>\n1\/R<sub>T<\/sub> = 1\/R<sub>1<\/sub> + 1\/R<sub>2<\/sub> + 1\/R<sub>3<\/sub>\u2026..+ 1\/Rn ____ for n numbers of resistors<br \/>\n<strong>EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>Differentiate between resistors connected in series and parallel\n<\/li>\n<li>State the relationship between resistance and conductance\n<\/li>\n<\/ol>\n<p>\u00a0<strong>Cells in series<\/strong>: end to end connections<\/p>\n<p>\u00a0<br \/>\n\u00a0E<sub>T<\/sub> = E + E + E = 3E<br \/>\nFor n cells; E<sub>T<\/sub> = n E<\/p>\n<p>\u00a0<br \/>\n\u00a0E<sub>T<\/sub> = E<sub>1<\/sub> + E<sub>2<\/sub> + E<sub>3<\/sub><br \/>\n\t<strong>Cells in parallel<\/strong>: side by side connections<\/p>\n<p>\u00a0<br \/>\n\u00a0<br \/>\n\u00a0<br \/>\n\u00a0E<sub>T<\/sub> = E+E+E\/3 = 3E\/3 = E<\/p>\n<p>\u00a0<strong>Calculations<br \/>\n<\/strong><\/p>\n<ul>\n<li>if 2\u03a9, 3\u03a9, and 5\u03a9 resistors are connected in (a) series (b) parallel, calculate the equivalent resistance\n<\/li>\n<\/ul>\n<p>(a)  R<sub>T<\/sub> = 2+3+5 = 10\u03a9<br \/>\n(b)  1\/R<sub>T<\/sub> = 1\/2 +1\/3+1\/5 = 15+10+6\/30 = 31\/30<br \/>\n\u00a0\u00a0\u00a0\u00a0  R<sub>T<\/sub> = 30\/31\u03a9<br \/>\n<strong>EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>If 2\u03a9, 2\u03a9, and 1\u03a9 resistors are connected in (a) series (b) parallel, calculate the equivalent resistance\n<\/li>\n<li>Calculate the potential difference across a resistor of resistance 2K\u03a9 that allows a current of 1mA to pass through it\n<\/li>\n<\/ol>\n<p><strong>Reading Assignment<\/strong> : Read more on series &amp; parallel connections of resistors &amp; cells \u2013 New school physics (pg 79)<\/p>\n<p>\t\t<strong>WEEKEND ASSIGNMENT<br \/>\n<\/strong><\/p>\n<ol>\n<li>If four identical cells each 2volts are connected in series, the equivalent pd is \u2026\u2026\u2026 (a) 2v (b) 4v (c) 6v (d) 8v\n<\/li>\n<li>If four identical cells each 2volts are connected in parallel, the equivalent pd is \u2026\u2026\u2026 (a) 2v (b) 4v (c) 6v (d) 8v\n<\/li>\n<li>If 2\u03a9, 2\u03a9, and 1\u03a9 resistors are connected in series the equivalent resistance (a) 5 \u03a9 (b) \u00bd \u03a9 (c) 4 \u03a9 (d) 2 \u03a9\n<\/li>\n<li>If 2\u03a9, 2\u03a9, and 1\u03a9 resistors are connected in parallel the equivalent resistance (a) 5 \u03a9 (b) \u00bd \u03a9 (c) 4 \u03a9 (d) 2 \u03a9\n<\/li>\n<li> Two resistors of resistance 1 \u03a9 are connected in parallel to a 2 \u03a9 resistor, the equivalent resistance is \u2026\u2026.. (a) 4 \u03a9 (b) 3 \u03a9 (c) 2 \u03a9 (d) 1 \u03a9\n<\/li>\n<\/ol>\n<p><strong>                                                THEORY<\/strong><\/p>\n<ol>\n<li>\n<div>A battery of 15v and internal resistance 5\u03a9 is connected to a resistor 0f 20\u03a9.\n<\/div>\n<p>Calculate the value of (a) electric current\u00a0\u00a0\u00a0\u00a0(b) terminal voltage\u00a0\u00a0\u00a0\u00a0(c) lost voltage.\n<\/li>\n<li>\n<div>If 8c of charge passes through a wire at a steady rate in 2s. calculate the\n<\/div>\n<p>Current.\n<\/li>\n<\/ol>\n<p>\t\t<strong>WEEK 3<\/strong><br \/>\n\t<strong>TOPIC : ELECTRICAL ENERGY AND POWER<br \/>\n<\/strong><strong>CONTENT : <\/strong>Electrical Energy<br \/>\n<strong><br \/>\n\t\t<\/strong>Electrical Power<br \/>\n<strong><br \/>\n\t\t<\/strong>Buying Electrical Power<br \/>\n<strong>Electrical Energy<br \/>\n<\/strong>Energy = Work (Joules)<br \/>\nW = QV_______________________(1)<br \/>\n But Q = It<br \/>\nW = VIt ______________________(2)<br \/>\nFrom ohm&#8217;s law V = IR<br \/>\nW = I<sup>2<\/sup>Rt______________________(3)<br \/>\nFrom ohm&#8217;s law I = V\/R<br \/>\nW = V<sup>2<\/sup>t\/R_____________________(4)<br \/>\nW = QV = VIt = I<sup>2<\/sup>Rt = V<sup>2<\/sup>t\/ R<br \/>\n<strong>Electrical Power<br \/>\n<\/strong>Power = work done\/time taken (watt) __ (5)<br \/>\nP =QV\/t = VI = I<sup>2<\/sup>R = V<sup>2<\/sup>\/R\u2026\u2026\u2026\u2026\u2026.(6)<\/p>\n<p>\u00a0<br \/>\n\u00a0<strong> EVALUATION<br \/>\n<\/strong>1. The headlamp of a car takes a current of 0.4A from a 12v supply.Calculate the energy produced in 5 minutes.<br \/>\n2. State four factors that affect the resistance of a conducting wire.<\/p>\n<p>\u00a0<br \/>\n\t\t<strong>Buying of Electrical Energy<br \/>\n<\/strong> Commercial power is consumed in kilowatt- hour (kWh)<br \/>\n  NB   1kwh = 3.6 \u0445106 J = 3.6MJ<br \/>\n    Cost = Pct\/ 1000\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.(7)<br \/>\n    P \u2013 Power (w)                     NB :  P(W)\/ 1000 = P (KW)<br \/>\n    c \u2013 Cost per kWh (unit) it means that it is in kWh<br \/>\n    T \u2013 Time (hr) <\/p>\n<p>\t\t<strong> EVALUATION<br \/>\n<\/strong><\/p>\n<ol>\n<li>Find the cost of running two 100w amplifier, ten 50w television and twenty 60w lamp for 24hrs, if the electrical energy cost 60k\/unit\n<\/li>\n<\/ol>\n<p>2.  A landlord has eight 40w electric lighting bulb, four 60w bulb and two 100w bulb. If he has all the point on for 5hrs, what is the bill for 30 days?<br \/>\n<strong>Reading Assignment<\/strong> : Read more on electrical energy &amp; power \u2013 New school physics (pg 81-82)<\/p>\n<p>\u00a0<br \/>\n\t\t<strong>WEEKEND ASSIGNMENT<br \/>\n<\/strong>1.\u00a0\u00a0\u00a0\u00a0Electrical energy is measured in (a) watt\u00a0\u00a0\u00a0\u00a0(b) kilowatt-hour\u00a0\u00a0\u00a0\u00a0<br \/>\n     (c) kilowatt\u00a0\u00a0\u00a0\u00a0(d) none of the above<br \/>\n2.\u00a0\u00a0\u00a0\u00a0If a p.d of 240v is applied across a lamp that supplies energy at the rate of 60w<br \/>\n      What is the value of current? (a) 0.2A\u00a0\u00a0\u00a0\u00a0(b)0.25A\u00a0\u00a0\u00a0\u00a0(c) 0.3A   (d) 3A<br \/>\n3.\u00a0\u00a0\u00a0\u00a0The resistance of the filament in question 2 is ______ (a) 96\u03a9      (b) 48\u03a9<br \/>\n      (c) 960\u03a9     (d) 900\u03a9<br \/>\n4.\u00a0\u00a0\u00a0\u00a0Calculate the conductance of a conductor having a resistance of 10\u03a9<br \/>\n       (a) 0.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0(b) 1\u00a0\u00a0\u00a0\u00a0   (c) 10\u03a9\u00a0\u00a0\u00a0\u00a0(d) 0.01\u03a9<br \/>\n5.\u00a0\u00a0\u00a0\u00a0The SI unit of resistivity is ____  (a) \u03a9\/M\u00a0\u00a0\u00a0\u00a0(b)\u03a9<sup>2<\/sup>\/M\u00a0\u00a0\u00a0\u00a0(c) \u03a9M<br \/>\n      (d) none of the above.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n<strong>                                   THEORY<br \/>\n<\/strong><\/p>\n<ol>\n<li>Find the cost of running two 100w amplifier, ten 50w television and twenty 60w lamp for 24hrs, if the electrical energy cost 60k\/unit\n<\/li>\n<li>A landlord has eight 40w electric lighting bulb, four 60w bulb and two 100w bulb. If he has all the point on for 5hrs, what is the bill for 30 days?\n<\/li>\n<\/ol>\n<p>\u00a0                                       \u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 WEEK 2 TOPIC: RESISTORS &amp; CELLS CONNECTED IN SERIES &amp;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,220],"tags":[],"class_list":["post-2673","post","type-post","status-publish","format-standard","hentry","category-posts","category-third-term-ss1-physics"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2673","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=2673"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2673\/revisions"}],"predecessor-version":[{"id":2674,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/2673\/revisions\/2674"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=2673"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=2673"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=2673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}