Current of Electricity

1 | Page ___________________________________________________________________________ Content • Electric current • Potential difference • Resistance and resistivity • Sources of electromotive force Learning Outcomes Candidates should be able to: (a) show an understanding that electric current is the rate of flow of charged particles. (b) define charge and the coulomb. (c) recall and solve problems using the equation Q = It. (d) define potential difference and the volt. (e) recall and solve problems using V = W/Q. (f) recall and solve problems using P = VI, P = I2R. (g) define resistance and the ohm. (h) recall and solve problems using V = IR. (i) sketch and explain the I-V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp. (j) sketch the temperature characteristic of a thermistor. (k) recall and solve problems using R =ρl/A. (l) define e.m.f. in terms of the energy transferred by a source in driving unit charge round a complete circuit. (m) distinguish between e.m.f. and p.d in terms of energy considerations. (n) show an understanding of the effects of the internal resistance of a source of e.m.f. on the terminal potential difference and output power. Current of Electricity (For ALL H1 and H2 Physics Students) Home Based Learning Please log-in to AskNLearn individually H1/H2 PHYSICS (2013) Instructions for HBL Learning Outcomes covered for H1 Physics includes (a) – (e) and (j) – (m) and H2 Physics includes the whole topic from (a) – (n). The requirement for Current of Electricity is the same for H1 and H2 Physics hence the notes is the same. Participation in online forum, quiz is compulsory. H1 Students This HBL is a revision from your Junior High Physics hence you should spend less than an hour on the notes to read up to page 11 and another 45 min to complete the tutorial, online discussion and online assessment (part 1) H2 Students Learning outcome (n), internal resistance of a source of e.m.f., is new content not learned in Junior High, hence you should spend more time going through page 12 -14 of your notes and go through the rest of the materials on AskNLearn. Suggested Time Allocation H1 Students 1.5 hr – Lecture notes and tutorial 0.5 hr – Online forum and assignment H2 Students 3.0 hr – Lecture notes and tutorial 1.0 hr – Online forum and assignment Optional – Self-explore Yenka Physics

Topic 2 | Page CONTENT Page Concept Map 3 1.0 Flow of Charged Particles 4 1.1 Charge and the Coulomb 4 1.2 Electric Current 4 2.0 Potential Difference and Electromotive Force 6 2.1 Electric Potential Difference 7 2.2 Electromotive Force 7 2.3 Differences between Electromotive Force and Potential Difference 8 2.4 The Volt 8 3.0 Resistance 8 3.1 The Ohm 9 3.2 Ohm’s Law 9 3.3 I-V Characteristics 9 3.3.1 Metallic Conductor at Constant Temperature 10 3.3.2 Fi