EXTRA QUESTIONS AS TUTORIAL
Pleas note: Problems are from Electrical Engineering, Hambley, 5
th
ed.,
2011.
1.10
The circuit element shown has v =  10V and i
ba
= 3 A. What is the value of
v
ba
? Be sure to give the correct algebraic sign. What is the value of i? Is energy
delivered to the element or taken from it?
Solution:
The positive reference for
v
is at the head of the arrow, which is terminal
b
. The
positive reference for v
ba
is terminal
b
. Thus, we have v
ba
= v = 10 V. Also,
i
is
the current entering terminal
a
, and i
ba
is the current leaving terminal
a
. Thus, we
have i = i
ba
= 3 A. The true polarity is positive at terminal
a
, and the true current
direction is entering terminal a. Thus, current enters the positive reference and
energy is being delivered to the device.
1.13
The current through a particular circuit element is given by
i(t) = 10 sin(200πt) A in which
t
is in seconds and the angle is in radians.
(a)
Sketch i(t) versus time for
t
ranging from 0 to 15 ms.
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 Spring '08
 DABBAGH
 Volt, Resistor, ohm, Electrical resistance

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