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Lower gauge wires are thicker with better sound quality.

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What effect does a speaker wire's gauge have on speaker sound quality?

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Coverage area. There are four frequency bands used throughout the world and a quad-cell phone would be able to access any of them.

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What's the primary advantage of a quad-band cell phone over a dual-band cell phone?

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Personal injury. The greatest concern when dealing with electricity is personal welfare.

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When working with electricity, you should assume that all electrical equipment is alive unless you know for certain otherwise. This prevents:

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When the current overcomes resistance in the wire, creating heat. This heat effect occurs when current must overcome the resistance of wire.

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The heat effect of current is created:

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Zener diode, which is available in a variety of voltages.

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What special type of diode is commonly used to regulate voltage?

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Voltage. It is the pressure of the current.

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Electromotive force is another way of saying

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Li-Ion battries. Much more so than Nickel Metal Hydride [NiMH] batteries.

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A primary advantage of using a Li-Ion battery instead o a NiMH battery in your cell-phone is:

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Base, emitter, and collector.

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Transistors contain at least three terminals called the:

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Two three-way switches.

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To control a light fixture from two different wall switches, you should use:

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Crystal amplifier.

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A transistor is also called a:

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Should be connected in series.

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To decrease capacitance, capacitors:

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2,500 ohms. K = one kilo or 1,000.

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A resistor marked 2.5K ohms has the value of:

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Voltage [V] = Current [I] x Resistance [R]

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Ohm's law states:

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Iron. It's easily magnetized and demagnetized, so it works well for this device.

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An electromagnetic-induction device usually has which of the following materials in its core?

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A bridge rectifier [aka full wave rectifier] contains 4 diodes. Rectifiers convert AC to DC current by only allowing it to flow one way.

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How many diodes should you expect to find in a bridge rectifier?

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Hertz [Hz]. The number of times AC changes direction in one second is known as frequency, which is measured in Hz.

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Another name for cycles per second is:

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SIM stands for Subscriber Identity Module. The card contains information such as your phone number, billing information, and address book. It makes switching phones much easier.

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Newer cell phones contain a removable memory card, which is often called a:

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Voltage [electric potential], ohms [resistance], and amperes [current] are always present when current flows through a wire.

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When current flows through a wire, the following influences are present:

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Inductors, which are rated in millihenries.

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Millihenries are related to:

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100,000 Megahertz [MHz]

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Radar can operate at frequencies as high as:

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Radio waves travel at the speed of light. The speed of sound is much slower.

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Radio waves travel:

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Rectification is the process of changing AC to DC.

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Changing alternating current to direct current is called:

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Insulated fittings replace soldering wires together.

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Insulated fittings can be used to splice wires, thus eliminating the need for:

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A battery symbol.

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The circuit symbol of six vertical lines of alternating lengths that do not touch in s circuit is:

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The Ohm symbol.

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The circuit symbol of a nearly completed circle, which looks sort of like a horseshoe at the ends is:

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There are 9 wires in serial cables used on computers. This is true, even if the cable has a 25-pin connector. Serial cables are often used to connect computers to perpetual devices.

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How many wires do serial cables used on computers have?

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Connecting capacitors in parallel produces the most capacitance.

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To produce greater storage of electrons and more capacitance, capacitors should:

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Power = Current x Voltage or Current = Power/Voltage. Which means, 60 / 120 = 0.5 ampere.

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A light bulb is 60 watts. Operated at 120 volts, how much current does it draw?

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The larger the number, the smaller the diameter of the wire. Thus, a number-12 is smaller than a number-6.

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A number-12 wire, compared to a number-6 wire:

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Because fuses are designed to prevent current overload at a specific level, a fuse with a high rating may not work properly for a lower level circuit.

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A fuse with a higher-than-required rating used in an electrical circuit:

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Whitish or natural colored.

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Neutral wire is always:

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Wattmeter, because electrical power is measured in watts.

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To measure electrical power, you would use a:

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The bulb will burn dimmer and last longer because its full potential isn't being used.

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If you operate an incandescent light bulb at less than its rated voltage:

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A cell is equal to 1.5 volts, so 9 volts / 1.5 volts = 6 cells.

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A 9-volt transistor contains:

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Live wires are black.

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The hot wire is always:

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A motherboard is the physical arrangement in a computer that contains the computers basic circuitry and components. It is 12 inches wide.

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How wide is the full AT motherboard?

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An on-off switch in the open position. It allows current to flow only when it's in the closed (on) position.

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The circuit symbol of two circles, one of which has a rod with the potential of connecting to the other circle.

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Determine the wattage that could cause the circuit breaker to trip with this formula: Watts = Amperes x Volts or 25 x 120 = 3,000 watts.

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If a 120-volt current is protected by a 25-amp circuit breaker, what's the largest number of watts an appliance can safely use?

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A rheostat, which is the type of variable resister that is used to control voltage.

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The circuit symbol of a rectangle with a lined arrow pointing towards the center of it is:

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It's the symbol for ground.

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The circuit symbol towards the end of the circuit that looks like an upside down triangle made up of lines of varying lengths.

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Larger wires require less electrical pressure or voltage to run current.

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Two electrical wires run to a machine. One wire is 6mm thick, and the other is 3mm thick. For the two wires to carry the same current, the larger wire:

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Rotor bars are found only on AC induction motors, not DC motors.

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Which of the following isn't a component of a DC motor?

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The ability of a current to contract muscles is called the physiological effect.

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A current passed through a muscle in the human body causes the muscle to contract. This is known as:

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In a closed circuit, one terminal is always positive, and the other is always negative.

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In a closed electrical circuit:

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Root Mean Square is the peak value of voltage multiplied by 0.707 (or sine 45).

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What does RMS stand for?

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The symbol is a fuse, which is designed to "blow" or melt if the current flowing through it exceeds a certain value.

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The circuit symbol of a rectangle with a wire line passing straight through its horizontal middle is:

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NTSC stands for National Television Standards Committee. The system is also used in Japan. PAL and SECAM are used in other countries.

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The television broadcast standard used in the United States is:

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The symbol is a lamp, which is a transducer that converts electrical energy to light.

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The symbol of a circle, with a slightly 'humped' wire going through its center:

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Conventional circuit breaker handles have four positions: on, off, trip, and reset. When tripped, the handle moves to the middle position.

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When a circuit breaker trips, in what position will you find the operating handle?

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The smaller the wire, the larger the number. So 12 AWG would be the smallest.

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Which wire is smallest?

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The symbol for a transformer. Transformers are used to step up [increase] and step down [decrease] AC voltages.

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The circuit symbol of two squiggly-dos on either sides of two vertical lines is actually:

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An example of a series circuit would be a string Christmas lights. If you break the circuit's path at any point, electricity will stop flowing and they will not work. Thus, there is only one path of flow.

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How many paths of electrical flow can be found in a series circuit?

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I (current/amperes) = Power (watts) / Effort (volts). In this case I = 1200 / 120 = 10 amperes.

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A microwave is rated at 1,200 watts. At 120 volts, how much current does it draw?

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Potential equals voltage; low potential is anything less than 600 watts.

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Electricians use the term "low potential" to refer to:

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Glass is an insulator. Other insulators are plastics, paper, and rubber.

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Which of the following isn't a conductor of electricity?

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Ground wires are always green.

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The ground wire is always:

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200 volts. Ohm's law states that V = IR. Thus, V = 10 x 20 = 200 volts.

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To cause a current of 10 amperes to flow through 20-ohms of resistance, the voltage needed is:

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Silver is a better conductor, but much more expensive.

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Silver is a better conductor than copper. But copper is more often used because of:

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Oscillators produce high-frequency AC.

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Electronic circuits that produce high-frequency AC are called:

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When DC is applied to an AC appliance, the amount of resistance is less, so more current flows through the wire and heat builds up.

answer

If you plug an appliance designed for AC into a DC power source, the appliance:

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