Applied Electricity Paper 2 , Nov/Dec. 2014

Questions:		1	2	3	4	5	6	7	Main

General Comments
Weakness/Remedies
Strength

Question 7
(a) Define the capacitance of a capacitor. (b) (i) List three types of capacitor. (ii) State two applications of a capacitor. (c) Write the equivalent capacitance of two capacitors connected in: (i) series; (ii) parallel.
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Observation
The expected answers were: (a) Capacitance of a capacitor is the ability of a capacitor to store electric charges. OR Capacitance of a capacitor is the ratio of the quantity of charge to the potential difference across the terminals of the capacitor. OR C = where Q is the quantity of charge and V is the potential difference across the terminals of the capacitor. (b) (i) Any three types of capacitor Paper Ceramic Electrolytic Mica Air capacitor Polyester (ii) Any two applications of capacitor Power factor correction Starting of single phase motor Blocking of direct current Decoupling Stores charges Smoothening Filtering Tuning circuit (c) (i) = = (ii) = + The question was on Magnetic Field and Electromagnetism. The question was not well attempted by candidates. The few candidates who attempted this question could not define capacitance, list types of capacitor and state applications of a capacitor.