ENGR 12
TEST 1
100 Points
NAME: ________________
Drills 10 Points Each:
1) For the following resistor, v = 30 milliVolts and i = 6 microAmps. What is R? 5 k Ohm
2) What is the power associated with the devices shown?
Indicate whether absorbing or producing power.
a)
b)
56W absorbing
3) What is the current ix?
-30W producing
4A
4) One of the voltage or current values in the circuit below has a polarity error (it should be the opposite
sense of the way it is labelled.) Find that value by performing KVL and/or KCL and correct the polarity
error.
– 2V + should be + 2V -
5) Series and Parallel. Find the effective resistance Rab (not a whole number!)
Rab = 1 + ( (3||6 + 10) || 3 ) = 1 + (2 + 10) || 3 = 1 + 12||3 = 3.4 k Ohm
6) Find the voltages V1 and V3 in the circuit below
V1 = (6||3)*20 / ( 6||3 + 5 + 2 + 1)
= 2*20/10 = 4 V
V2 = 2* 20 /10 = 4 V
7) Find the current I in the circuit below
I = 10 * 10 / (10 + 15 ) = 4 mA
EXTRA CREDIT (5 Points) if you have time. BUT MAKE SURE you do problem 8 on back side FIRST!!!!!
Determine the value of R so the effective resistance of this network is 9 ohms.
R = 15 Ohms
(Continued on Back)
8) (30 Points) The current i1 in the circuit below is given as 5A as shown. Using KVL, KCL and OL,
determine the power associated with the Dependent Voltage Source (and say whether absorbing or
producing power). You may may obtain partial credit by computing the circuit variables indicated in
the answer sheet.
ANSWER SHEET
i2:
v3:
i3:
i4:
v5:
ix:
i5:
1A
2V
2A
3A
7V
5A
-2A
Power in dependent source is:
-14 W producing