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aturday, 24 September 2011
Basic Electrical Engineering Interview Questions 1
hat is Current?
urrent can be defined as the motion of charge through a conducting material. The unit of current is Ampere whilst charge is
easured in Coulombs.
ease define Ampere
he quantity of total charge that passes through an arbitrary cross section of a conduct-ing material per unit second is defined
s an Ampere.
athematically,
=Q/tQ = It
here Q is the symbol of charge measured in Coulombs (C), I is the current in amperes (A) and t is t he time in seconds (s).
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basic electrical interview questions
2/3
osted by ElectEngr Bhatti at 11:35
abels: Electrical Basics
ould you measure current in parallel?
o,Current is always measured through(in series with) a circuit element.
hat Is the difference between Voltage or Potential Difference? And What are they?
oltage or potential difference between two points in an electric circuit is1V if 1J (Joule) of energy is expended in transferring 1
of charge between those points.
is generally represented by the symbol V and measured in volts (V). Note that the symbol and the unit of voltage are both
enoted by the same letter, however, it rarely causes any confusion.
he symbol V also signifies a constant voltage (DC) whereas a time-varying (AC) voltage is represented by the symbol v or v(t)
ould you measure Voltage in series?
o, Voltage is always measured across(in parallel with) a circuit element
ow many Types of Circuit Loads are there in a Common Electrical Circuit?
load generally refers to a component or a piece of equipment connected to the output of an electric circuit. In its
ndamental form, the load is represented by any one or a combination of the following:
Resistor (R)
Inductor (L)
Capacitor (C)
load can either be of resistive, inductive or capacitive nature or a blend of them. For example, a
ht bulb is a purely resistive load where as a transformer is both inductive and resistive. A circuit
ad can also be referred to as a sink s ince it dissipates energy whereas the voltage or current supply can be termed as a
ource.
hat are the different Sign Conventions used in electric circuits?
is common to think of current as the flow of electrons. However, the standard convention is to take the flow of protons to
etermine the direction of the current.
a given circuit, the current direction depends on the polarity of the source voltage. Current always flow from positive (high
otential) side to the negative (low potential) side of the source as shown in the schematic diagram of Figure 2.4(a) where Vs
the source voltage, VL is the voltage across the load and I is the loop current flowing in the c lockwise direction.
Source current leaves from the positive terminal
Load (Sink) current enters from the positive terminal
hat do you mean by Passive Circuit Elements and why these are called Passive?
assive Circuit Elements:
esistor, Capacitor, Inductor
tate and define Ohms Law?
is t he most fundamental law used in c ircuit analysis. It provides a simple formula describing theltage-current relationship in a conducting material.
atement:
he current through a conducting material is directly proportional
the voltage or potential difference across the material.
V
= RI or I =V/R
R =V/I
here the constant of proportionality R is called the resistance or elect rical resistance, measured in ohms ().
ease Define Ohms Law for A.C(Alternating Current)?
verything else would remain same only the resistance will be replaced with Impedance, which is defined as the opposition to
e flow of A.C.
hat is the function of Capacitor in Electrical Circuits?
capacitor is a passive circuit element that has the capacity to s tore charge in an electric field. It is widely used in electric
rcuits in the form of a filter.
hy Inductors are installed in electrical Circuits?
n inductor is a piece of conducting wire generally wrapped around a core of a ferromagnetic material. Like capacitors, theye employed as filters as well but the most well known application is their use in AC transformers or power supplies that
onverts AC voltage levels.
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comments:
Jothi Baskar 11 August 2013 at 18:47
thank uuuu
....
niceee...
i m expecting more
Reply
Abdullah 19 September 2013 at 04:19
lush push
Reply
Rahul Chowdhury 15 January 2014 at 11:02
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The statement of ohms law is wrong. i is proportional to v
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