By K C A Smith; R E Alley
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A capacitor has the ability to store a quantity of static electricity. The symbols for a fixed capacitor and a variable capacitor used in electrical circuit diagrams are shown in Fig. 4. The charge Q stored in a capacitor is given by: Q = / X t coulombs where / is the current in amperes and t the time in seconds. Problem 1. d. across a 4 μΡ capacitor when charged with 5 mC. (b) Find the charge on a 50 pF capacitor when the voltage applied to it is 2 kV. C = 4μΡ = 4 X 10^F; Q = 5mC = 5 X 10"3C. Since (a) r Ö.
State three advantages and one disadvantage of mica capacitors. 24. Name two disadvantages of paper capacitors. 25. Between what values of capacitance are ceramic capacitors normally available? 26. What main advantages do plastic capacitors possess? ) Charge and capacitance 1. Find the charge on a 10 μ¥ capacitor when the applied voltage is 250 V. 5 mC] 2. Determine the voltage across a 1000 pF capacitor to charge it with 2 μ θ . [2 kV] 3. 4 kV. Determine the capacitance of the capacitor. 5 μ¥] 4.
7 V] 5. d. at the terminals of a battery is 16 V when no-load is connected and 14 V when a load taking 8 A is connected. Determine the internal resistance of the battery. 25 Ω] 6. f. 2 Ω supplies a load taking 10 A. d. at the battery terminals and the resistance of the load. 8 Ω] 7. 1 Ω are connected in series to a load of 21Ω. d. at the battery terminals. [(a) 1 A (b) 21 V] 8. For the circuits shown in Fig. 9 the resistors represent the internal resistance of the batteries. f. across PQ, (b) the total equivalent internal resistances of the batteries.
Electrical circuit theory by K C A Smith; R E Alley