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UNIVERSITY OF TECHNOLOGY
ELECROMECHNICAL DEPARTMANT
SYSTEMS BRANCH
Dr. Sameir Abd Alkhalik Aziez
1. (Figures 1, 2, & 3) Find the potential at point P relative to ground.
(22.8 V;
-3.1 V; 5 V)
2. (3) Find the source & ground currents. (3A; 2A; 1A)
3. (4) Find the values, of E and R. (10 V; 4 ohms)
4. (6) Given that V = 24 Volts, find E. (148 V).
5. (7) Find the applied voltage V and current I. (24 V; 10 A)
6. (9) Find the current in the 9 mV source, (0.5 micro-amps)
7. (10) Find the current in the 240 V source. (0.576 A)
8. (18) If I = 0, what is R?
(23.75 ohms)
9. (11) Find all source currents. (1 A; 3 A; 4 A)
10. (12) Find the current in the 6 ohm resistor. (2.1 A)
11. (13) Find the current in the 60 V source, the voltage across the 12 A
source, and the potential to ground at P. (1 A; 70 V; -30 V)
12. (16) Find the current in the 12 V source. (1 A)
13. (5) The resistors R
1
, R
2
, and R
3
have the values R, R, and 2R
respectively, the total input power is 30 W. Find the power dissipated in each
of the resistors. Also find the percent increase in input power when the applied
voltage is increased by 20 %. (18 W; 8 W; 4 W; 44 %)
14. (8) With the switch in position 1, the ammeter reads 1.46 A and the
voltmeter reeds 2.35 V. In position 2, the readings are 1.25 A and l.0 V. Find
the ammeter resistance and the supply voltage V
s
. (0.8 ohms; 3.518 V)
15. (8) Continue question 14 to find the voltmeter resistance and the resistance
R. (11.2 ohms; 1.88 ohms)
16. (5) The resistors R
1
, R
2
, and R
3
have the values 100, 200, and 470 K-ohms
respectively. They ere rated at 1.0 W, 0.5 W, and 0.5 W respectively. Find the
maximum permissible voltage V.
(553 V)
FIRST YEAR ELECTROMECHNICAL
ENGINEERING
BASICS ELECRICAL ENGINEERING
Question Sheet (2)
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17. (17) Find the currents in the 8 ohm resistor and in the sources.
( 1A; 3.6 A; 19A; 14.6 A )
I8. (14) Find the value of the resistance R. (1.0 ohms)
19. (15) Find the value of the resistance R. (1.67 ohms)
20. (4) Assume the current in the 42 V source is not given; show that it must
be 3 A.
21. (15) Assume the current in the 5 ohm resistor is not given; show that it
must be 2 A.
NB: In the circuit diagrams, all resistance values ore in ohms.
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