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Feb 25, Download EEC Electrical Engg Science 1 Practical. UNESCO-NIGERIA UNESCO TECHNICAL & VOCATIONAL EDUCATION REVITALISATION PROJECT-PHASE PROJECT II NATIONAL DIPLOMA IN. Eec Practical- Electrical Engineering - Download as PDF File .pdf), Text File .txt) or read online.

Basicamente se diferencian tres tipos de texturas: If on the other hand, some electrons are added to the atoms of a body, then negative charge out-balance thee positive charge and the body is said to be negatively charged. Notice that the current is the same at all points Parallel Circuits A parallel circuit is formed when any number of resistors are connected starts-to-starts and ends-to-ends so that there is different paths for current to flow. The Fermi level lies within the forbidden band gap In the parlance of solid-state physics, semiconductors and insulators are defined as solids in which at absolute zero 0 K , the uppermost band of occupied electron energy states, known as the valence band, is completely full. Moving — Coil Instruments Accurate measurement of current and potential difference voltage is needed in all branches of electricity and their applications,for example in television, radio telecommunications, dynamosand motors. Voltage division principle WEEK Figure 2 shows different configuration of parallel circuits.

Connect the leads to the right terminals at the meter 3. Switch on the circuit if necessary. Adjust the range until you get clear readings.

Apply the following formula to obtain the measured quantity. The range was set to XV. So the measured voltage is 3. Multimeter Note: The scale has to be viewed from an angle perpendicular to it. Measuring the Voltage Voltage can be considered as the pressure that force the electrons to flow.

The voltage is being measured by measuring the difference between the voltages at the two terminals of the device-under-test which is the voltage drop. This can be performed using a measuring instrument called voltmeter.

The voltmeter connection in the circuit is a parallel connection. Figure 1 illustrates how to connect voltmeter in the circuit to measure the voltage across the resistor. Procedure 1.

Adjust the range of the meter 2. Connect the leads in the true terminals of the meter 3. Apply the other ends of the leads to the resistor under test 4. Connect the simple circuit shown in the figure below 2. Open the circuit between the source and the resistor 3. Connect the ammeter terminals to one end of the resistor and to the source 4. Switch on the power supply and record the reading. If the meter did not give any movement or tried to move backward, then switch the terminal leads with each other 8 Figure 1 illustrates how to connect ammeter in the circuit and measure the current.

Figure 1: This procedure is shown in figure 2. Adjust the meter so that when the two terminals are short circuited, the ohmmeter reads zero 2.

Disconnect the resistor to be measured from the circuit why? Apply the meter leads to the resistor terminals resistor is parallel to the meter 4.

In the following figure it shows a table of the meaning of each colour. The fourth band is the tolerance band i.

Select a number of different resistors 2. Use the table below to determine their values 3. Use ohmmeter to measure the same resistors you figured out 4. Compare your calculated values with the readings you obtained 11 Resistors color code: Series circuit: Series circuit is the simplest circuit. The conductors, loads and power supply are connected with only one path for the current. The same amount of current will flow through each load. However, the voltage across each load will be different.

Figure 1 shows different configuration of series circuits.

Connect a number of resistors is series 2. Measure the current in the circuit. What do you notice? Connect two identical lamps in series. The resistors can be actual resistors or other devices that have resistance like lamps.

Figure 6. There is only way for current to get from point A to point B. Resistor in series In an actual circuits diagram, a series circuit may be easy to identify as those in figure 6. Some examples of series circuits.

Notice that the current is the same at all points Parallel Circuits A parallel circuit is formed when any number of resistors are connected starts-to-starts and ends-to-ends so that there is different paths for current to flow.

There is two ways for current to get from point A to point B. Resistor in series In an actual circuits diagram, a parallel circuit may be easy to identify as those in figure 6. For example. Some examples of parallel circuits. Notice that the current is the same at all points 25 Simple d. Circuits Week 7 At the end of this week, the students should be able to: Example 7. Calculate the length of the wire.

Solution Here, we are given: Calculate the conductivity of the conductor. It should be noted that: Circuits Week 8 At the end of this week, the students should be able to: By this law for purposes of explanation, we may regard currents entering a node as positive, where currents leaving the node as negative.

Considering the node in Fig 8. This is an alternative way of stating KCL.

Mathematically this can be stated as: Circuits Week 9 At the end of this week, the students should be able to: The theorem state the following: In a circuit containing several sources of e. In order to apply the superposition principle it is necessary to remove all sources other than the one being examined. A current source is zeroed by replacing it with an open circuit, since the current through an open circuit is zero amps.

Example 8. Solution To solve this problems we shall follow the steps. Step III: The circuit diagram of Fig 9. Turn back to fig 9. Draw the corresponding circuit diagram if the original circuit diagram of Fig 9.

The total branch currents can be obtained by adding up algebraic as follows: Circuits Week 10 At the end of this week, the students should be able to: Calculate the temperature raise of the coil. Assuming the temperature coefficient of resistance of copper to be 0. Calculate its resistance at C.

Assuming the temperature coefficient resistance of copper to be 0. Energy Energy is the ability to do work. The SI unit of energy is the Joules. The Joules can be defined as the work done when a force F of 1N Newton acts through a distance d of 1m in the direction of the force. For example, an electric motor converts electric energy into mechanical energy. The various forms of energies are related by the law of conversation of energy. The Law of Conversation of Energy states that Energy can neither be created nor destroyed.

This means that when needs to be converted; the total energy in a system is equal to the total energy output from the system. For example a car in motion has mechanical Kinetic energy and when the brake are applied for it to come to rest, this mechanical energy is converted into heat energy and sound energy.

For an electric fan to rotate it takes voltage supplies from the main supply and causes the electric motor to rotate. This action in turn causes the blades of the fan to rotate and produce wind energy a form of mechanical energy and sound energy.

In this case, electric energy was converted to mechanical energy and sound energy.

Lager units of power could be kilowatt. Also in dealing with large amount of energy, it is sometimes more convenient to express energy in kilowatt hour than in joules. Calculate the power produced.

Calculate a the current and b the resistance of the heating element.

Solution Given that: Under normal circumstances an atom is electrically neutral which means that the aggregate of positive charge of protons is exactly equal to the aggregate of negative charge of electrons. But if somehow some electrons are removed from atoms of body, then it is left with a preponderance of positive charge and the body is said to be pensively charge. If on the other hand, some electrons are added to the atoms of a body, then negative charge out-balance thee positive charge and the body is said to be negatively charged.

Therefore the deficiency of electrons of the atoms in a body makes it to be positively charged while the excess of electrons of the atoms in a body makes it negatively charged, so the charge is known as the total deficiency or excess of electrons in a body and the unit is in Coulomb abbreviated C.

First Law: Second Law: Now we should know that: The charge of an alpha particle is 3. Charge of election is 16 X 10 C. At Low-bias levels, there is very little anode current, and thus it is in the off state or forward- blocking region.

As VAK is increased from 0, the anode current, fA' gradually increases, as shown on the graph. EEC Theory Pdf. Download Read.

Size px x x x x Customer Width: Copy and paste this code into your blog or website copy code. Click here to download this file View more ebooks on www. Click here to download this file. Search tags: EEC Theory pdf Unlike other capacitor microphones, they require no polarizing voltage, but normally contain an integrated preamplifier which does require power often incorrectly called polarizing power or bias. EEC Theory pdf 1.

EEC Theory pdf One leg of the bridge is the lead-lag circuit, and the other is the voltage divider. EEC Theory pdf Whenever a conductor is moved within a magnetic field as shown in fig.

EEC Theory pdf Place one hand behind his head and neck for support.