Questions №1 Constant current linear electric circuits

Worked out by: Sharofov S.
Head of “EEE” Department: Usmonov Sh.
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QUESTIONS №9
1.Constant current linear electric circuits:
(definition of constant current, elements, types of consumers, sources of constant current, series and parallel connection of resistors, work and power of electric current in a circuit, modes of operation of electric circuits, direct operation , short circuit, normal mode)
2. R₁=15- resistor is connected in series to a 120-V generator and two R₂=10- 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 R₂ resistor?
e. What is the potential difference across the R₁ resistor?
3. Periods T = 2.5 • 10^-4; 10^-3; 20 • 10-²; 5 • 10^-5; 8 • 10-⁴; Find the angular frequency of a sinusoidal current.


Worked out by: Sharofov S.
Head of “EEE” Department: Usmonov Sh.
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QUESTIONS №10
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. A R₁=20 Ohm lamp and a R₂=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.
3. 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.