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Unformatted text preview: An ac series circuit has 12 ohms resistance, 15 ohms inductive reactance and 10 ohms capacitive reactance. If an effective emf of 120 V is applied to the circuit, then what is the effective (rms) current value? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 3.3 A 2. 4.0 A 3. 9.2 A 4. 36.0 A The primary winding of an electric train transformer has 400 turns and the secondary has 50. If the input voltage is 120 V(rms), what is the output voltage? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 480.0 V 2. 60.0 V 3. 15.0 V 4. 10.0 V An ac series circuit has 12 ohms resistance, 15 ohms inductive reactance and 10 ohms capacitive reactance. If an effective (rms) emf of 120 V is applied, what is the power output? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 1200 W 2. 1108 W 3. 1022 W 4. 598 W A transformer consists of a 500 turn primary coil and a 2000 secondary coil. If the current in the secondary is 3.0 amps, what is the primary current? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 0.75 A 2. 1.33 A 3. 12.0 A 4. 48.0 A In an ac series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. zero 2. 45 3. 90 4. 180 In an ac series circuit, the voltage in the inductor differs in phase with the voltage in the capacitor by what angle? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. zero 2. 45 3. 90 4. 180 The capacitive reactance in an ac series circuit will change by what factor when the frequency is tripled? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 1/3 2. 1/9 3. 3 4. 9 An ac series circuit with a peak current of 20 A will have what effective (rms) current? 1 2 3 4 25% 25% 25% 25% 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1. 28.2 A 2. 7.1 A 3. 14.1 A 4. 20.0 A In the inductor of a 60 cycle ac series circuit, the peak voltage precedes the peak current in each cycle by what time intervals?...
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This note was uploaded on 04/09/2009 for the course PHYS 1B taught by Professor Briankeating during the Spring '07 term at UCSD.
 Spring '07
 BRIANKEATING
 Current, Resistance

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