EEE393 Basic Electrical Engineering
13 Feb 2007, Tuesday (bring to the class)
HOMEWORK 1
1. a) Each of the below v-i relationships describe a circuit element. Which one is a linear
circuit element?
b) An electric oven is rated 2200W. How much current does it draw? What is the internal
resistance of the oven? (Assume 220V. Ignore AC effects).
c) Express power dissipated in a resistance (P) in terms of current (i) and resistance (R).
d) Give an example of a mathematical model that is a simplified version of the real physical
device/system/process etc. When does the difference start to become important? Is there a
more appropriate model for those situations? (You can give an example from your own
field also).
e) When you try to start a car while the headlights are on, the headlights dim when you turn
the ignition. Can you explain why? (Hint: Think of the car battery as a voltage source,
and consider question (d) above).
2.
3.
v
i
v
i
v
i
V = 5
⋅
i
2
+i/2
+
+
i
2
i
1
i1 = ?
i2 = ?
R
2
R
1
V
2
V
1
i1 = ? vba = ?
i2 = ? bde = ?
What is the power supplied
by the current source?
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