Motor, Speed Control of D. Motors, Testing of D. This revised multicolour edition contains a new chapter, Special Machines. Special emphasis has been placed on chapters covering motors. The objective test section has also been thoroughly revised. Tweet Share Share. This product does not have any reviews yet - be the first to write one.
Textbook of Electric Technology Volume 2 by B.
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Theraja ISBN: SKU: Electrical technology is a field that covers many divisions of electrical engineering such as basic electrical engineering, electronics, instrumentation, control systems, and communication systems. KES 1, Small motors can be bought at most hobby stores, and each student can take turns disassembling it. The classic DC motor has a rotating armature in the form of an electromagnet with two poles. A rotary switch called a commutator reverses the direction of the electric current twice every cycle, to flow through the armature so that the poles of the electromagnet push and pull against the permanent magnets on the outside of the motor.
As the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet. During that instant of switching polarity, inertia keeps the classical motor going in the proper direction. See the diagrams below. A battery can be made by placing a galvanized zinc-plated nail and a copper wire in a small container filled with vinegar.
Do not let the zinc and copper terminals touch one another.
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They can be held apart by punching small holes in the container's lid and inserting them through these holes. A film canister works pretty well for this, but so will a paper or foam cup covered with plastic wrap or just put the two conductors on opposite sides of the container.
As long as the two conductors can both be immersed in the vinegar without touching one another, a voltage should develop between them. It might help to brighten the nail and the copper with sandpaper or emory cloth first. A cell constructed like this will generate about 0. The copper wire will be the positive terminal anode and the zinc plated nail will be the negative terminal cathode. Connect multiple cells in series to form a battery and boost the voltage. When doing this, be sure to connect the positive terminal copper of one cell to the negative terminal zinc of the other.
Connect multiple cells in parallel to boost the current capacity necessary to light up a bulb. To do this, connect all the nails together with one wire and connect all the copper terminals together with another wire. There are many types of fuses.
Some of them have threaded bases and can be removed by rotating them counter-clockwise. Others have to be pried out of their holders. Always remember that household current is dangerous, so it is best to cut the power first.
This requirement can also be met by changing the fuse in an automobile or appliance unplug first! A breaker is a current-sensing switch. Circuits can be turned off by flipping the switch away from the center of the breaker panel, and turned back on again by flipping the switch towards the center of the breaker panel. When a breaker senses that the current flowing through it exceeds its rated threshold, the switch opens by itself, moving the toggle between the off position and the on position.
The breaker is said to have "tripped" when this happens. Before a tripped breaker can be reset, it must first be turned fully to the off position, and then it can be returned to the on position. If the breaker trips again, the circuit is still overloaded. If this is the case, turn off some of the appliances in the circuit before attempting to reset the breaker again.
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First, do not touch the person! Instead, turn off the power as quickly as possible. If you cannot find the switch, use a non-conducting pole such as a wooden broom handle, a non-metallic chair, a shoe, or some similar object and move the wire off the person. Be sure to move the wire far enough away so that it will not reconnect with the victim when released.
Be careful to not touch the wire with any part of your body. Once the victim has been disconnected from the current, call If the victim is not breathing, start CPR. If the victim is breathing, but unconscious, maneuver the body onto its side to prevent the victim's tongue from blocking the air passage. The schematic above shows a typical circuit in a household.https://nernondcornbubbsa.tk
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The circuit as shown is protected by a fuse although a breaker would be applicable as well , and has three loads:. More outlets and switches can be added to the circuit, but note that they will all be connected in parallel. All circuits will connect to the black "'hot'" wire and to the white "'neutral'" wire. A typical house will have about two dozen breakers, and it is rare for a circuit to have more than about eight outlets or lights.
Having too many lights or outlets on a single circuit will cause the breaker to trip or the fuse to blow, so several circuits are run in a house. Electric meters measure electricity in kilowatt hours. One kilowatt hour kWh will provide watts for one hour. Electric companies typically charge a flat rate per kilowatt hour, and this rate can be found on an electric bill.
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