ECE 220 Practice Exams

PART I

3300pf capacitor = 3.3nF

Rab = 3 + (3+3)//3 = 5ohms

Ckt element with 3A flowing into +9V terminal absorbs 27W

8k in series with 16k and 12V source drops 4V across the 8k

10V across 0.5 S(iemen) resistor causes current of -5A from - to + terminal

9k resistor in parallel with 1 k resistor and 10mA source dissipates 9 mW
(in 9k)

Kyle needed 0.8 ohms for the bridge to be balanced

Vo = -10V in mesh (using KVL: (-2mA)6k -Vo + (1mA)2k =0 )

PART II

Ckt element absorbs 47.22 J in first 5 secs

10mA current source (in parallel with R and dep current source) delivers 100uW

60-ohms resistor in single big loop dissipates 15 W

8A flows through 3-ohm resistor in current divider ckt

Vo in bridge ckt (delta-wye conversion) drops 1.6V

Rab in resistor network with short ckt = 11ohms

Vo across air-gap from hanging leads in bridge-like network = 3V (12V is
connected to a 1:1 and and 1:3 voltage divider)

Meter is designed to measure voltages of 0-10V