Basic Physics II Evidences - DrJJ - UiTM

TOPIC LEARNING OUTCOMES REMARKS HOUR4.1 Ohm’s law and Resistivity a) Define electric current.b) Explain the relationship between current flow, electric fieldand potential difference between two points in a circuit.c) Define electromotive force (emf) of a battery and explain itsrole to current flow in a circuit.d) Draw an equivalent circuit to represent a battery with emf εand internal resistance r and explain its effect to the currentflowing in circuit.e) State and mathematically write Ohm’s law.f) State and explain the relationship between the resistance of awire to its physical dimensions and to its resistivity.g) Explain the concept of potential drop across a resistor in asimple circuit.ΔQ‣ I = ,Δt‣ V=IRdQI =dt‣ R =ρlA‣ Introduce conductivity as theinverse of resistivity1‣ σ =ρ‣ Simple circuit is limited to onlyone load (bulb or resistor)‣ V = ξ − Ir34.2 Electrical energy andpowera) Define electrical power and explain joule heating in aresistor.b) Determine the dissipative power and energy loss in a simplecircuit.‣ Include2P = I R and2VP =Rfor power.‣ Emphasize on V as potentialdifference across resistors.‣ P = VI and Energy ≡ VIt1Physics Lesson Outcomes-Electricity & Magnetismhttp://drjj.uitm.edu.my; HP:+60-19-355-1621Page 5 of 12Prepared by Assoc. Prof. Dr. Jaafar Jantan aka Dr. JJEmail: jjnita@salam.uitm.edu.my; drjjlanita@hotmail.com