Week 3 Electrical Circuits and Components

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Nov 2, 2013 (3 years and 11 months ago)


Week 3

Electrical Circuits and Components

It’s a Radio!

Electrical current comes in

different forms depending

on the source creating the


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.


Power company


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



What type of

current is

flowing through

this circuit?

Direct current



Which of these

circuits is a




Some common Components used in Electronics

It’s a Radio!

The function of a
capacitor is to

store and release
electrical energy.


A capacitor is made from

two conducting surfaces

separated by an

insulating material, called

the dielectric.

The property of storing electric

energy is called capacitance

Capacitance is measured in farads.

The purpose of the capacitor is

to smooth out voltage changes.

See videos about capacitors


Function is to store magnetic energy ,



is made

from a

coil of


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.


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

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?


What electrical component
stores energy in an electric


What type of electrical component

consists of two or more

conductive surfaces separated

by an insulator?


What type of electrical component

stores energy in a magnetic field?


What component prevents ac current

from flowing in the “wrong” direction

in a circuit?


Representations of components in a
wiring diagram are schematic symbols.

What is component 6 in the
schematic above?


What is component 7 in the
schematic shown above?


Where is the diode located on the
schematic diagram above?

5, 8 and 10

What component is shown at

4 in the schematic above?


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


Some components are used

to prevent equipment damage

or safety hazards such as fire

or electrical

shock due

to equipment


Fuses “blow” when

excessive current

melts a short

length of metal.

Fuses are not re

Circuit breakers

“trip” when the

current overloads.

They can be reset.

Always replace a fuse or

circuit breaker with the same

size or model to avoid creating

a safety hazard.