practicas de ingles

An atom is the smallest particle that makes up any substance. The main part of an atom is made up of a nucleus. Protons and neutrons are contained within the nucleus. The electrons that orbit the nucleus complete the atom. An electrically balanced atom has an equal number of protons and electrons. An electrically charged atom is called an ion. An ion can have a positive charge or a negative charge. Materials that are conductors can allow the flow of electrically charged atoms and create drift. This is the movement that creates an electric current. The current will not flow through materials that are insulators. What is the smallest particle of any substance?. A proton. A neutron. An atom. An electron.

Where are protons and nuetrons found?. In the nucleus. In the air. In the electron cloud. In the current.

What is the name of an atom with an electric charge?. lon. Neutron. Proton. Conductor.

What creates an electric current?. The movement (drift) of charged atoms. The light in a bulb. The presence of neutrons. The color of the material.

What materials do not allow current to flow?. Conductors. Wires. Insulators. Metals.

Part 1: Configuration Two or more circuit components are usually connected in three basic ways: series, parallel and series-parallel. All three examples are closed circuits. Current will not flow through an open circuit. A series circuit is a circuit with only one path for the current to flow. Electricity flow continuous in one direction. A parallel circuit has more than one path for the current to flow. if one leg of the path is broken, the current will continue through the others. In a series-parallel circuit, current flows through both series and parallel configurations. This more complex configuration is common where there are several connected nodes. An abnormal connection can lead to a short circuit. This happens when current travels along the wrong path, causing overcurrent. This creates a hazardous situation that can lead to damaged equipment, overheating and even fires. Many electrical systems include branch circuits. These run between outlets, fixtures or motors and protective fuse boxes. What are the three basic types of circuit connections?. Open, closed, and short. Simple, complex, and advanced. Series, parallel, and series-parallel. Direct, indirect, and alternating.

When does current not flow?. In a closed circuit. In a parallel circuit. In a series circuit. In a open circuit.

What happens if one leg of a parallel circuit is broken?. The current stops completely. The circuit explodes. The current continues through other paths. The fuse box turns off.

What is a short circuit?. A circuit with low voltage. A circuit that uses batteries. An abnormal connection causing overcurrent. A circuit with many paths.

What do branch circuits connect?. Computers and routers. Outlets, fixtures or motors with fuse boxes. Wires and batteries. Switches and light bulbs only.

Section 2.1 Tools Needed All employees of Talbot Electrical Services will bring their own tool kits. Tool kits need to contain the basic tools needed for electrical jobs. These basic tools are sold at most hardware stores. Pliers are needed for pulling and cutting wires. Your kit needs to include long nose pliers and end cutting pliers. Side cutters and diagonal cutters are recommended. You must have wire strippers in your kit. Make sure they are able to strip the most common wires. You will also need several types of screwdrivers for the job. A flashlight, measuring tape and utility knife will round out your kit. Where can employees buy the basic tools?. In toy shops. At hardware stores. At supermarkets. In bookstores.

What are pliers used for?. Painting walls. Pulling and cutting wires. Measuring electricity. Fixing computers.

What types of pliers should be in the tool kit?. Long nose and end cutting pliers. Only long nose pliers. Flat pliers and hammer pliers. Small pliers only.

What tool is needed to remove the coating from wires?. A screwdriver. A hammer. Wire strippers. A knife.

Electrician`s Drill Kit All electricians need a high-quality drill. Along with it, they need lots of drill bits. The Electrician`s Drill Bit Kit has everything you need. It contains several spade bits. These bits are perfect for most jobs. For other jobs, the kit has auger bits, hole saw bits and wood augers. Also included are twelve twist bits. Electrician`s Power Saw Set This set includes three saws all electricians should have. The tough circular saw cuts through anything! The powerful reciprocating saw comes with five blades. Finally, the jigsaw is perfect for cutting. What tool does every electrician need?. A hammer. A high-quality drill. A screwdriver. A flashlight.

What are spade bits used for?. For most jobs. For metal only. For decoration. For painting.

What other bits are included in the kit?. Auger bits, hole saw bits, and wood augers. Only twist bits. Hammer bits and nail bits. No other bits.

What is special about the circular saw?. It is very light. It cuts through anything. It needs no electricity. It is used only for wood.

What is the jigsaw perfect for?. Painting. Cutting. Measuring. Cleaning.

Most jobs can be done using a simple rotary drill. It can be used for wood and plywood. It can also be used for drywall, plaster, cooper and steel. Of course, you need to have the right drill bits too. What about harder materials like brick and concrete? A hammer drill works well for blocks, brick, mortar and stone. A rotary hammer works best for materials like concrete and cement. However, a hammer drill chips away at the material. A rotary hammer pounds away at it to make a hole. What is a rotary drill used for?. Only for brick and concrete. For wood, plywood, drywall, plaster, copper, and steel. Only for metal. Only for stone.

Which drill is best for harder materials like brick and concrete?. Rotary drill. Hand drill. Screwdriver. Hammer drill.

Which materials are better for a rotary hammer?. Concrete and cement. Brick and mortar. Wood and plywood. Drywall and plaster.

What do you need to use a dirll correctly?. The right type of drill bits. Extra power cables. Water and oil. A computer.

How are the terms hammer drill and rotary hammer sometimes used?. To describe different brands. To mean the same tool. To refer to saws. To describe small tools.

Fasteners and tools use imperial measurements or metric, and knowing the difference is important. It prevents you from rouding off a fastener, damaging tools, or causing injury. If you don`t know an item´s size, use a micrometer or other caliper to measure it. Check centimeters or millimeters for metric tools. Look at inches for imperial tools. You will also need to know larger measurements, such as feet, yards, and meters. These measurements are often used in building plans. Temperature measurements are also imprtant to know. Some contries measure degrees using the Fahrenheit scale and others use te Celsius scale. You may to convert from one scale to the other. What can happen if you use the wrong size tool?. You might damage the fastener or hurt yourself. The tool will last longer. The measurement will be more accurate. It will tighten better.

What instrument can you use to measure small items?. Thermometer. Ruler. Caliper or micrometer. Tape measure.

What system uses centimeters and millimeters?. Imperial system. Metric system. Fahrenheit system. English system.

What are feet and yards used for?. Measuring temperature. Measuring distance in building plans. Measuring weight. Measuring pressure.

Before you begin, determine your goal. If you want to measure current, an ammeter is needed. Remember, an ammeter must connect in a series with the circuit. To measure voltage, use a voltmeter. The voltmeter is set up differently. It connects in parallel with the part of the circuit to be measured. The third option is to measure resistnace with an ohmmeter. Most circuits can be measured with a multimeter. This can be used to measure voltage, current or resistance, it is also known as a universal instrument, in Unit 2 we will discuss how to connect each instrument to the correct terminal. Which instrument is used to measure current?. Voltmeter. Ohmmeter. Ammeter. Digital tester.

How must an ammeter be connected in a circuit?. In parallel. In series. In a diagonal path. It does not need to be connected.

Which instrument is used to measure voltage?. Ohmmeter. Ammeter. Voltmeter. Multimeter only.

Which instrument can measure voltage, current, and resistance?. Ohmmeter. Multimeter. Ammeter. Voltmeter.

What is another name for a multimeter?. Universal instrument. Parallel meter. Terminal connector. Energy analyzer.

Electrical shock is caused by current flowing through the human body. This can result in serious or fatal injuries. Protect yourself from electrical circuits by using insulating materials. Materials that resist electrical currents are called insulating materials. these materials are used to separate electrical conductors, not allowing current to pass between them. Insulating materials are used as protective coatings on electrical wires and cables. Materials such as PVC, rubber, rigid laminate, paper, and dry wood very good insulators. Bushings are used where exposed bare high-voltage cables are supported by electrical poles. These bushings are made from porcelain, glass, or composite polymer materials made from resin. Insulation is also necessary in power systems, such as small transformers, generators and electronics. Wire coils are insulated with polymer varnish or fiberglass tape. Vinyl Tape is also used to coat electrical wires. Finally, synthetic rubbers, like neoprene, are good insulators. These materials are versatile and resistan to oil, weather, and heat. What causes electrical shock?. Voltage stored in batteries. Current flowing through the human body. Touching plastic surfaces. Lack of insulation.

What is the main purpose of insulating materials?. To increase electrical speed. To decorate electrical cables. To resist electrical currents. To produce heat.

What are insulating materials used for?. To conduct more electricity. To separate electrical conductors. To store electrical power. To generate energy.

What is vinyl tape used for?. To make circuits faster. To decorate wires. To coat electrical wires. To create circuits.

According to the text, insulation is necessary in: Water sistems. Power systems like transformers and generators. Kitchen appliances only. Vehicles only.

A conductor is a material with a moveable electric charge. The electrons in atoms of conductors have more freedom to move than in atoms of insulators. These free electrons can float in space between adjacent atoms. This relative mobility is called electric conductivity. It is determined by the atoms that make up a substance. The most familiar conductors are metals, such as copper and aluminium. Silver is the best conductor, but it is very costly. Here are some additional examples of metallic conductors: gold, iron, brass-mercury, steel, bronze Some non-metallic materials are electrical conductors as well. These include: graphite, salt solutions and all types of plasma. An additional option is conductive concrete, formed from coalesced particles. The amount of conductivity that a material possesses varies dependign upon temperature and other factors. When chosing a conductor, consider where and how it will be used. Cost and availability are also important factors. What is a conductor?. A material that blocks electric charge. A material with a moveable electric charge. A material that has no electrons. A material that produces electricity.

What gives conductors their electric conductivity?. Their color. Their weight. The mobility of their free electrons. The number of atoms they contain.

Which metal is the best electrical conductor?. Copper. Aluminum. Silver. Steel.

Conductivity of a material varies depending on: Taste and color. Temperature and other factors. The size of the material. How heavy the material is.