14 D.C. Circuits

• Revision:  key ideas in
• current electricity & DC circuits
• thermistor & LDR 
• Notes: 2014-S4-PhyNotes-14-DC_Circuits-Answers.pdf
• Assignment AS 14.1  answers 2014-S4-Phy-AS14.1-DCCircuits-Ans.pdf New 
• Q1(a): 6 V, 0 V; 1(b): 0.60 A;     Q2(a): 5.75 ohm; 2(b): 1.04 A
• Q3: 5.0 V;     Q4(a): 2.4 A; 4(b): 1.6 ohm;     Q5(a): 0.40 A; 5(b): 0 A
• Q6(a): L1 brighter than normal, L2 & L3 equally dim;   6(b): L1 & L2 equal normal brightness;   6(c): L2 & L3 equally much brighter than normal
• Q7: As S moves from A to B, voltmeter reading increases from 0 V to 4.0 V
• Q8(a) 6.0 V, (b) 3.0 V, (c) 0.0 V, all with same current I = 0.02 A
• Assignment AS 14.2 answers 2014-S4-Phy-AS14.2-Transducers-Ans.pdf New 
• Q1(a): resistance of thermistor decreasing; (b): 0.045 A, 44 ohm, 0.090 W
• Q2(a): 600 ohm, 25 ohm; (b) change from 12 V to 6.0 V; (c) 0 to 10 deg
• Q3(a) 230 kohm; (b): 1.9 kohm 
• Resources: 

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