Essays Tagged: "Direct current"

Manual Metal Arc Welding (MMA) & Gas Metal Arc Welding (GMAW)

he arc re-establishes its original length.Equipment:The basic equipment consists of:Power source: A direct current unit of design and capacity according to particular usage, i.e. motor generator for s ...

(9 pages) 68 0 4.0 Mar/2002

Subjects: Science Essays > Engineering > Mechanical Engineering

Electromagnetism: Physics, science 1 investigation.

material (e.g. steel), and a solenoid are required.Place the steel into the solenoid, connect to a direct current supply, and turn on. Then switch off the supply and a magnet is produced.To destroy t ... coils.(2) Use a current of 0.5A..(3) Set up apparatus as shown in the diagram.(4) Put power pack on direct current.(5) Put some Panel pins into a glass container.(6) Switch on the power supply.(7) Put ...

(4 pages) 54 0 4.3 Mar/2003

Subjects: Science Essays > Physics

The Electric Generator.

o main types of generators - alternating-current (AC) generators (sometimes called alternators) and direct-current (DC) generators (also known as dynamos). Both types of generator work on the same pri ... tor shown in Figure 1 produces alternating current, in which the electricity flows regularly in one direction and then the other, in a loop of wire. Slip rings and brushes on each end of the loop of w ...

(4 pages) 81 0 3.0 Jun/2003

Subjects: Science Essays > Physics

The purpose of the experiment is that of examining a half and full wave rectifier circuit by recording and comparing the results of each circuit.

because current flows through the diode only for that half of the AC wave, which is in the forward direction. The output waveform therefore consists of the positive half of the sine wave only (Fig 1) ... half of the sine wave only (Fig 1), with the result that the output circuit although flowing in one direction only, is not smooth DC.By connecting a DC meter across the load resistor in the half wave ...

(3 pages) 52 1 2.5 Jan/2004

Subjects: Science Essays > Engineering > Chemical Engineering

Photovoltaics (Solar Cells).

Photovoltaics (solar cells) are semiconductor devices that convert sunlight into direct current (DC) electricity. Groups of PV cells are electrically configured into modules and arr ... ontact. When sunlight strikes the surface of a PV cell, this electrical field provides momentum and direction to light-stimulated electrons, resulting in a flow of current when the solar cell is conne ...

(1 pages) 42 0 3.5 Jan/2004

Subjects: Science Essays > Technology

Current from Synchronous Machines During Faults

A synchronous machine is called "synchronous" because their speed is directly related to the frequency of the line by the equation ¥øs = [2¥ðf / (p/2) ... nt lags the excitation voltage by approximately 90¨¬. The short-circuit armature current is directly proportional to the field current over the range from zero to well above rated armature cur ... would in turn refer to Lenz's law. Lenz's law states that a change in flux induces voltages in such directions that the currents produced by these voltages in closed circuits would tend to oppose the ...

(9 pages) 26 0 4.3 Apr/2004

Subjects: Science Essays > Engineering > Electrical Engineering

How an electric motor works

A Direct Current Motor has 6 essential parts: armature, or rotor; commutator; brushes; axle; field mag ...

(1 pages) 86 2 2.8 Apr/2004

Subjects: Science Essays > Engineering > Electrical Engineering

My electronics assignment about transisters, it has information about the transister and about its history, ( questions from the assignment are included in the text ).

s invented by Sir John Ambrose Fleming in 1904. The vacuum tube could convert altering current into direct current, and it could convert AC signals into DC signals.Explain the function of a transi ...

(2 pages) 27 0 3.0 Jun/2004

Subjects: History Term Papers

Capacitors: the bascics, applications

apacitor is used to connect a signal from one part of a circuit to another but without allowing any direct current to flow.If the current flow is alternating between zero and a maximum, our "storage t ...

(4 pages) 32 0 4.6 Oct/2004

Subjects: Science Essays > Physics

Confronting Reality

onfrontation with reality requires that these external components be identified and analyzed, using direct current information, to help understand the root causes of the dynamics of change.Another imp ... lities requires looking at how these factors may affect your clients. They may not be affecting you directly, but are affecting you through them. There are three critical questions for you to ask as y ...

(5 pages) 45 0 3.0 Jun/2005

Subjects: Businesss Research Papers

Diagnostic Test: 12V alternator Output test

ven by a belt from the crankshaft. The alternator develops alternating current, which is changed to direct current. Alternating current changes from positive (+) to negative (-) at a regular cycle. Di ... tive (-) at a regular cycle. Direct current does not change from positive (+) to negative (-). Only direct current can be used to charge a battery. As the battery drain continues, and engine speed inc ...

(1 pages) 12 0 3.0 Jun/2005

Subjects: Science Essays > Engineering > Mechanical Engineering


ables involved in Ohm's Law- Current, Voltage, and Resistance.Theory: The Ohm's law states that the direct current flowing in a conductor is directly proportional to the potential difference between i ... minal are connected properly. Otherwise, the pointer of the current meter will deflect in the wrong direction when current passes through the circuit and this could very well damage the meter itself.2 ...

(4 pages) 25 0 4.0 Dec/2005

Subjects: Science Essays > Physics


t it still holds the charge until you touch the two wires together. They are also used to filter DC current and noise (for a clearer signal).The Capacitor A capacitor is an electronic componen ... t it still holds the charge until you touch the two wires together. They are also used to filter DC current and noise (for a clearer signal).The Capacitor A capacitor is an electronic componen ...

(3 pages) 1706 0 0.0 May/2001

Subjects: Humanities Essays


vely affect the biosphere. Solar DHW, solar (active) space heating, passive solar space heating and direct solar-electric conversion with the use of photovoltaic cells (PV) [2] are some of the current ... nologies.A photovoltaic cell is a solid state semiconductor device, which convert solar energy into Direct Current (DC) electrical energy [3]. The life span of a PV cell is approximately twenty years ...

(9 pages) 71 0 0.0 Nov/2001

Subjects: Businesss Research Papers


ash; One 1N4002 diode Theory: An ideal inductor offers no resistance to the flow of direct current. However, all inductors do have some internal DC resistance, which is easily measured ... oscope as well as with the DMM voltmeter over the same points. (Make sure that the scope is set for Direct Coupling "DC" not AC).a. Vag should be around 4.8V peak-to-peak i. With a max ...

(4 pages) 1856 0 0.0 Feb/2008

Subjects: Science Essays > Chemistry

Solar Panels

In this article, we will examine solar cells to learn how they convert the sun's energy directly into electricity. In the process, you will learn why we are getting closer to using the sun ... frame). Photovoltaics, as the word implies (photo = light, voltaic = electricity), convert sunlight directly into electricity. Once used almost exclusively in space, photovoltaics are used more and mo ... w freely. Electric fields from the PV cells actually force the freed electrons to flow in a certain directions. This flow of electrons is called a current. For us to use this current externally, we ju ...

(3 pages) 16 0 2.3 Mar/2009

Subjects: Science Essays > Technology

How To Manual Unit 3

losing any important information for our clients.B. SPS (Stand-by power supply) is a device powered directly from the main power, with the battery charging. The battery is the stand-by power supply. S ...

(4 pages) 1710 0 0.0 Jan/2010

Subjects: Science Essays > Computer Science

electrolysis of aluminum

ot happen because the electric current cannot pass through solid salts.A D.C current, also known as direct current: this is current that supplies the electrolysis process. This energy supplied by the ... ions is called discharging. The energy providing all these reactions and changes is supplied by the direct current external source At the negative electrode reduction takes place where positively char ...

(10 pages) 3 0 0.0 May/2014

Subjects: Science Essays