WEEK 2B: BASIC ELECTRICAL CIRCUITS

Question 1

an interconnection of electrical devices through which
current flows

Answer 1

circuit

Question 2

A circuit is typically composed of

Answer 2

• Power source (battery, wall outlet, generator)
• Conductors or wires
• load

Question 3

: A combination of various elements (or groups of elements) through
which current flows (or is expected to flow).

Answer 3

electric network

Question 4

An electric network with the presence of loops. (That is, electrons can
flow back to an initial position if allowed to move through circuit elements.)

Answer 4

electric circuit

Question 5

The mathematical model of a physical device
used to analyze its behavior

Answer 5

circuit element

Question 6

• In circuit analysis, these are basic
  units that cannot be subdivided into other simple circuit
  elements (e.g. single resistor).

Answer 6

simple circuit element

Question 7

May be composed of or represented
by one or more simple circuit elements (e.g. DC Machine).

Answer 7

general circuit element

Question 8

capable of delivering/supplying power to
some external element.

Answer 8

active element

Question 9

always consumes energy

Answer 9

passive element

Question 10

• Active circuit element
• Voltage across it is completely independent of current passing
  through it.
• Its current is determined by other elements in the circuit.

Answer 10

indeependent voltage source

Question 11

• Active circuit element
• Current passing through it is completely independent of voltage
  across it.
• Its voltage is determined by the other elements in the circuit.

Answer 11

independent current source

Question 12

The source quantity (voltage or current) is determined by a voltage or
current in some other location in the system under consideration.

Answer 12

dependent/controlled source

Question 13

• Passive circuit element
• Mathematical model:
  Ohm’s Law: v = R*i
  where R = resistance

Answer 13

resistor

Question 14

circuit element with resistance
approaching zero.

Answer 14

short circuit

Question 15

may be
treated as short circuit.

Answer 15

conductors

Question 16

Voltage across a short
circuit

Answer 16

zero

Question 17

circuit element with resistance
approaching infinity.

Answer 17

open circuit

Question 18

• The process of a determining the relationships of voltages, currents,
  power, and other parameters/quantities in a circuit.

Answer 18

circuit analysis

Question 19

analysis of a circuit that is governed by direct
current (DC) sources (e.g. batteries).

Answer 19

DC circuit analysis

Question 20

basic electrical circuit laws (4)

Answer 20

• Ohm’s law: V=IR
• Power equations: P = V x I = I2R = V2/R
• Kirchhoff’s Current Law (KCL)
• Kirchhoff’s Voltage Law (KVL)

Question 21

ohm’s law

Answer 21

V = IR

Question 22

power equations

Answer 22

P = V x I = I^2R = V^2 / R

Question 23

Currents entering and leaving any node (or junction) must add up to
zero
At a node, the algebraic sum of currents is equal to zero
“total current or charge entering a
junction or node is exactly equal to the charge leaving the node as it has no other
place to go except to leave, as no charge is lost within the node“.

Answer 23

kirchhoff’s current law (KCL)
I(exiting) + I(entering) = 0.

Question 24

refers to a connection or junction of
two or more current carrying paths or elements such as cables and components

Answer 24

node

Question 25

for current to flow either in or out of a node a [?] must exist.

Answer 25

closed circuit path

Question 26

About any closed loop, the algebraic sum of voltages is equal to zero
“in any closed loop network, the total
voltage around the loop is equal to the sum of all the voltage drops within the same
loop”

Answer 26

kirchhoff’s voltage law (KVL)

Question 27

• Two electric circuits are said to be equivalent with respect to a pair of
  terminals if:

Answer 27

• the voltages across the terminals AND
• the currents through the terminals
  are identical for both circuits.

Question 28

the principle of equivalence

Answer 28

• If V1 = V2 and I1 = I2, then with respect terminals ab and xy, circuit 1 and
  circuit 2 are equivalent.

Question 29

Two devices are said to be in [?] if the same current flow through
both of them. Follows from KCL

Answer 29

series (definition: series connection)

Question 30

Two devices are said to be in [?] if they are both connected to the
same pair of nodes. From KVL, the voltage across each of them will be
the same.

Answer 30

parallel (definition: parallel connection)