Questions №1 Constant current linear electric circuits

Worked out by: Sharofov S.
Head of “EEE” Department: Usmonov Sh.

QUESTIONS №17

1. 
   Three-phase alternating current electric circuits
   

(system, energy source, EMF, phase shift, phase, line, consumer, generator, transmission line, rotor, stator, induction, symmetrical, EMF expression, sequence, vector diagram, star, triangle, line and phase voltage, relationship, neutral, Kirchhoff's laws, sum, symmetrical consumer)

2. 
   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
   
3. 
   F ill out the table for the circuit diagramed at the right.
   

Circuit Position	Voltage (V)	Current (A)	Resistance (Ω)	Power (W)
1			15.0
2			25.0
3			35.0
Total	12

Worked out by: Sharofov S.
Head of “EEE” Department: Usmonov Sh.
---------------------------------------------------------------------------------------------------------------------


QUESTIONS №18

1. 
   Transformers:
   

(transformation, power line, nominal, current, magneto conductor, magnetic flux, electric state, coefficient, magnetic state, operating current, direct operation, external, real, short circuit, diagram, efficiency, three-phase, o measurement, electrical connection)

2. 
   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.
   
3. 
   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.

1. 
   Calculate the equivalent resistance of the circuit shown.
   
2. 
   Determine the resistance of resistor R shown in the diagram.
   

Worked out by: Sharofov S.
Head of “EEE” Department: Usmonov Sh.
---------------------------------------------------------------------------------------------------------------------

QUESTIONS №19

1. 
   Single-phase alternating current electric circuits
   

(output, transmission, sinusoidal, 50 , frequency, analytical expression, graphical expression, vector expression, diagram, instantaneous value, period, phase, angular displacement, complex number, abstract value, real value, math operation, irreversible process, advance, lag behind, active, reactive, instantaneous power, field energy)

2. 
   R₁ =16 Ohm and R₂ =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?
   
3. 
   L amp 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
   

4. 
   Is this a series or parallel circuit?
   
5. 
   If a light bulb A was removed would light bulb B still work? Light bulb C?
   
6. 
   Would the removal of any light bulb affect the other two?