Questions №1 Working principle of a dc generator: There are two types of generators–dc generators
Download 406.64 Kb.
|
elektr javob
|
QUESTIONS №1 Working principle of a DC generator: There are two types of generators–DC generators and AC generators. Both DC and AC generators convert mechanical power to electrical power. A DC generator produces direct power, while an AC generator produces alternating power. Both of these generators produce electrical power based on the principle of Faraday’s law of electromagnetic induction. The two most basic parts of the generator: Magnetic field Conductors moving within this magnetic field . D etermine the equivalent (total) resistance for each of the following circuits below. In a kitchen, three 25 W bulbs are connected in parallel across 120 V. All three bulbs are on. At 7:00 am, a 360 W coffeepot also in parallel is turned on. Calculate the total current drawn. Split Phase Induction Motor F ill out the table for the circuit diagramed at the right.
In a kitchen, three 75 W bulbs are connected in parallel across 120 V. All three bulbs are on. At 6:00 am, a 360 W coffeepot also in parallel is turned on. Calculate the total current drawn. Basic working principle of transformer Fill out the table for the circuit diagramed at the right.
An Electric iron is rated 1500W, 220V. Find the current drawn & resistance of the heating element 1) Quvvat = Voltaj * Oqim 2) Quvvat = (Tok) ^ 2 * Qarshilik Tokni topish uchun 1-formulalardan foydalanish. Quvvat = Voltaj * Oqim 1000 = 240 * Oqim oqimi = 1000/240 Oqim = 4,1667 Amper. Qarshilikni topish uchun 2-formulalardan foydalaning. Quvvat = (Oqim) ^ 2 * Qarshilik 1000 = (4,1667 * 4,1667) * Qarshilik 1000 = (17,3614) * Qarshilik qarshiligi = 1000/17,3614 Qarshilik = 57,6 ohm. Describe the construction details of single-phase transformer Fill out the table for the circuit diagramed at the right.
An electric hob with power R = 1500 W is connected to the AC mains with voltage U = 220 V. Determine the current, resistance, and amount of energy consumed by the hob during operation t = 2 hours. Self-Excited DC Generator Questions 1 and 2 refer to the following: The diagram to the right represents an electric circuit consisting of four resistors and a 12-volt battery. 1) What is the equivalent resistance of the circuit shown? 2) What is the current measured by ammeter A shown in the diagram? The angular frequency of an alternating current ω= 3140; 942; 12560; 5024; 94200; If 10048 • 1 / sec, find the frequency and period of the signal. Basic working principle of transformer Two resistances, one 62 and the other 88 , are connected in parallel. The resistors are then connected to a 12-V battery. a. What is the equivalent resistance of the parallel combination? b. What is the current through each resistor? An electric hob with power R = 500 W is connected to the AC mains with voltage U = 220 V. Determine the current, resistance, and amount of energy consumed by the hob during operation t = 4 hours. Three-phase alternating current electric circuits A 35-, 55-, and 85- resistors are connected in parallel. The resistors are then connected to 35-V battery. a. What is the equivalent resistance of the parallel combination? b. What is the current through each resistor? A coil with an inductance of 0.01 G is connected to a network with a voltage of 127 V and a frequency of 50 Hz. Determine the reactive resistance of the circuit, the current in it and the reactive power: Determine the reactive resistance and current at a frequency of 500 Hz. Transformers Resistors R1, R2, and R3 have resistances of 15.0 , 9.0 , and 8.0 respectively. R1 and R2 are connected in series, and their combination is in parallel with R3 to form a load across a 6.0-V battery. a. Draw the circuit diagram. b. What is the total resistance of the load? c. What is the current in R3? d. What is the potential difference across R2? An electric hob with power R = 600 W is connected to the AC mains with voltage U = 220 V. Determine the current, resistance, and amount of energy consumed by the hob during operation t = 3 hours. Asynchronous machines A 15.0-resistor is connected in series to a 120-V generator and two 10.0- resistors that are connected in parallel to each other. a. Draw the circuit diagram. b. What is the total resistance of the load? c. What is the current in one of the 10.0-resistors? e. What is the potential difference across the 15.0-resistor? Periods T = 2.5 • 10-4; 10-3; 20 • 10-2; 5 • 10-5; 8 • 10-4; 4 • Find the angular frequency of a sinusoidal current. Single-phase alternating current electric circuits A 20 Ohm lamp and a 5 Ohm lamp are connected in series and placed across a potential difference of 50 V. What is the equivalent resistance of the circuit? What is the voltage drop across each lamp? What is the power dissipated in each lamp? Draw the circuit diagram. If the frequency of the alternating current is f = 400 Hz; 25 Hz; 2 Hz; 40 Hz; If it is 1250 kHz, find the period T. Three-phase alternating current electric circuits The load across a battery consists of two resistors, with values of 15 Ohm and 45 Ohm connected in series. Draw the circuit diagram. What is the total resistance of the load? What is the voltage of the battery if the current in the circuit is 0.1 A? The angular frequency of the alternating current is shown in Figs. Determine the frequency and period of that current Give information about the symbols of the circuits used in electrical circuits A lamp having a resistance of 10 Ohm is connected across a 15 V battery. What is the current through the lamp? What resistance must be connected in series with the lamp to reduce the current to 0.5A? Three resistors, whose values are 35 , 45 , and 85 , are connected in parallel across a 35 V battery. What is the current through the 35 resistor? Draw the circuit diagram, find the power in each resistor Describe the construction details of single-phase transformer Three resistors, whose values are 30 , 45 , and 90 , are connected in parallel across a 35 V battery. Draw the circuit diagram. What is the current through the 45 resistor? T = 0.2 s; 1 s; 40 ms; 50; 250; Determine the frequency f and angular frequency ω. Give some application of D.C motor A 15 resistor, a 12 resistor and a 35 resistor are connected in series across a potential difference of 120 V. Draw the circuit diagram. Calculate the voltage drop across the 15 resistor. C omplete the table of values for this circuit: State all Krichoff's law of voltage and current write the formula Three resistors, whose values are 35 , 45 , and 85 , are connected in parallel across a 35 V battery. What is the current through the 85 resistor? Draw the circuit diagram Complete the table of values for this circuit: DC machines A 10 resistor, a 11 resistor and a 39 resistors are connected in series across a potential difference of 120 V. Find the voltage across all the resistors. Draw the circuit diagram Lamp A has a resistance of 15 ohms, lamp B has a resistance of 12 ohms, lamp C has a resistance of 35 ohms, find the total resistance of the circuit and answer the questions below Is this a series or parallel circuit? If a light bulb A was removed would light bulb B still work? Light bulb C? What would happen if light bulb B. was removed? Direct current electric circuits and methods of their calculation An Electric iron is rated 1000W, 240V. Find the current drawn & resistance of the heating element Lamp A has a resistance of 15 ohms, lamp B has a resistance of 12 ohms, lamp C has a resistance of 35 ohms, find the total resistance of the circuit and answer the questions below Is this a series or parallel circuit? If a light bulb A was removed would light bulb B still work? Light bulb C? Would the removal of any light bulb affect the other two? Single-phase alternating current electric circuits Three resistors, whose values are 35 , 45 , and 85 , are connected in parallel across a 35 V battery. Find the current across all the resistors. Draw the circuit diagram Lamp A has a resistance of 15 ohms, lamp B has a resistance of 12 ohms, lamp C has a resistance of 35 ohms, and the total voltage of the circuit is 120 V. Find the total resistance of the circuit and the voltage across each resistor, and answer the questions below How many pathways are there for electricity to flow through? Is this a series or parallel circuit? If light bulb A was removed would light bulb B still work? Light bulb C? Three-phase alternating current electric circuits A 10 resistor, a 11 resistor and a 39 resistors are connected in series across a potential difference of 120 V. Find the voltage across all the resistors. Draw the circuit diagram Fill out the table for the circuit diagramed at the right.
Define: Node (OR) Junction, Loop & branch In a kitchen, three 75 W bulbs are connected in parallel across 120 V. All three bulbs are on. At 6:00 am, a 360 W coffeepot also in parallel is turned on. Calculate the total current drawn. Questions A through B refer to the following: 50 ohm resistor, an unknown resistor R, a 120-volt source, and an ammeter are connected in a complete circuit. The ammeter reads 0.50 ampere. Calculate the equivalent resistance of the circuit shown. Determine the resistance of resistor R shown in the diagram. What is Circuit? What are the types of electrical circuits? A 12 Ohm resistor and a 15 Ohm resistor are connected in parallel and placed across the terminals of a 15 V battery. What is the equivalent resistance of the parallel circuit? What is the current through the entire circuit? What is the current though each branch of the parallel circuit? Questions A through B refer to the following: A 3.0-ohm resistor, an unknown resistor, R, and two ammeters, A1 and A2, are connected as shown below with a 12-volt source. Ammeter A2 reads a current of 5.0 amperes. Determine the equivalent resistance of the circuit shown. Calculate the current measured by ammeter A1 in the diagram shown. Calculate the resistance of the unknown resistor, R in the diagram shown The main conditional symbols in electric circuits and the main types of electric circuit schemes Three 600 resistors are connected in parallel, and 5 V are applied across the parallel circuit. How much current is there out of the source? Lamp A has a resistance of 35 ohms, lamp B has a resistance of 45 ohms, lamp C has a resistance of 85 ohms, find the total resistance of the circuit and answer the questions below Is this a series or parallel circuit? If a light bulb A was removed would light bulb B still work? Light bulb C? What would happen if light bulb B. was removed? Direct current electric circuits and methods of their calculation A 16 Ohm and a 20 Ohm resistor are connected in parallel. A difference of potential of 40 V is applied to the combination. Compute the equivalent resistance of the parallel circuit. What is the current in the circuit? How large is the current through the 16 Ohm resistor? Lamp A has a resistance of 35 ohms, lamp B has a resistance of 45 ohms, lamp C has a resistance of 85 ohms, find the total resistance of the circuit and answer the questions below Is this a series or parallel circuit? If a light bulb A was removed would light bulb B still work? Light bulb C? Would the removal of any light bulb affect the other two? Mention the application of DC generator? A circuit contains a 10 Ohm heater and six 240 Ohm lamps, each containing a 60 Watt bulb, all connected in series. The voltage across the circuit is 120 V. What is the current in the circuit when only 4 lamps are turned on? What is the current in the circuit when all the lamps are turned on? A 10- resistor is connected in series to a 120-V generator and two 5 resistors that are connected in parallel to each other. a. Draw the circuit diagram. b. What is the total resistance of the load? c. What is the current in one of the 5 resistors? e. What is the potential difference across the 10 resistor? Download 406.64 Kb. Do'stlaringiz bilan baham: 
|