# Week 3 Electrical Circuits and Components

Ηλεκτρονική - Συσκευές

2 Νοε 2013 (πριν από 4 χρόνια και 5 μήνες)

101 εμφανίσεις

Week 3

Electrical Circuits and Components

Electrical current comes in

different forms depending

on the source creating the

voltage.

Current that flows in only 1 direction all

the time is called direct current (DC)

Batteries and solar cells produce direct current

Currently that regularly reverses

direction is alternating current.

generator

Power company

(Utility)

A circuit is a complete path through

which current can flow.

Any break in the circuit will prevent
the flow of electricity throughout the
whole circuit. (open circuit)

There are two basic types of pathways that

can be set up for electric current to flow.

A series circuit is connected

so that there is only 1 pathway

through which current can flow

A parallel circuit is connected

to provide each component

with its own pathway.

What is the name of a current

That flows in only one direction?

Direct current (DC)

Are these bulbs

connected in

a series

or a parallel

circuit?

Parallel

What type of

current is

flowing through

this circuit?

Direct current

A

B

Which of these

circuits is a

series

circuit?

A

Some common Components used in Electronics

The function of a
capacitor is to

store and release
electrical energy.

Capacitors

two conducting surfaces

separated by an

insulating material, called

the dielectric.

The property of storing electric

energy is called capacitance

The purpose of the capacitor is

to smooth out voltage changes.

Inductors:

Function is to store magnetic energy ,

An

inductor

from a

coil of

wire.

The property of storing magnetic

energy is called inductance

Inductance is measured in henries.

The purpose of the inductor is

to smooth out current changes.

Resistors:

Function is to control the flow of current.

Resistors have a certain specified

resistance measured in ohms (

)

Some resistors are variable, meaning the

Resistance can be changed. This type of

resistor is called a potentiometer,

and is the type of component used as

a volume control.

Diodes allow current to
flow in only 1 direction,
meaning it can turn an

ac current into a dc
current by stopping the
flow in the wrong
direction.

LED=Light Emitting Diode

Transistors use voltage
or current signals to
control current flow.

Transistors can be used
as either an electronic
switch or an amplifier.

Gain is the term used that describes a
transistor’s ability to amplify an signal.

Circuit board showing component parts

What electrical component is

used to oppose the flow of

current in a circuit?

Resistor

What electrical component
stores energy in an electric
field?

Capacitor

What type of electrical component

consists of two or more

conductive surfaces separated

by an insulator?

capacitor

What type of electrical component

stores energy in a magnetic field?

Inductor

What component prevents ac current

from flowing in the “wrong” direction

in a circuit?

Diode

Representations of components in a
wiring diagram are schematic symbols.

What is component 6 in the
schematic above?

Capacitor

What is component 7 in the
schematic shown above?

Resistor

Where is the diode located on the
schematic diagram above?

5, 8 and 10

What component is shown at

4 in the schematic above?

Transformer

Where is the component located
that is used to connect or
disconnect this circuit?

3

Some components are used

to prevent equipment damage

or safety hazards such as fire

or electrical

shock due

to equipment

malfunction

Fuses “blow” when

excessive current

melts a short

length of metal.

Fuses are not re
-
usable!

Circuit breakers

“trip” when the