Exam #2 Review Flashcards
True or False - In a free body diagram, when the free body is made of several parts, the forces the various parts exert on each other must be included among the external forces.
False
True or False - Free body diagrams always show the free body detached from the ground.
True
Describe simply what the following conditions mean?
∑Mx = 0 ∑My = 0 ∑Mz = 0
Moment of all forces x, y, z in balance. Forces = 0.
Formula for Work?
W = F*d
SI units of Work?
Work = N*m = (J) Joules
The most common charge or current carriers in the body are:
a) ions b) electrons c) protons
a) ions
Finish the sentence: “The passive sign convention (psc) states that the positive sign for the voltage reference is put on the side of the resistor where the positive current ____ “
a) leaves b) enters
b) enters
The direction of positive current is in the same direction as?
a) electron flow b) positive ion flow c) negative ion flow
b) positive ion flow
What is the direction of “easy” positive current flow (the short-circuit direction) for the diode shown? —-▷|—
a) left to right b) right to left c) depends on the sign of charge
a) left to right
If you were taking a Kirchhoff Tour (KT) in the direction shown by the curved arrow below, what would be the contribution across the resistor R?
--------- a) -i b) -v c) +i d) +v
| ↶KT
|
^ R
i
b) -v
In the ideal op amp model, what is the value of the input resistance Ri?
a) 0 b) Rf c) ∞
c) ∞
The voltage gain of a voltage follower circuit has what value?
a) vo/Vs = 1 + R2/Rf
b) vo/Vs = 1
c) vo/Vs = R2/Rf
b) vo/Vs = 1
True or False - In a stable op amp circuit, the feedback resistor must be connected from the output back to the inverting input.
True
What is Ohm’s Law?
Linear relationship between current and voltage.
v = i R
