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NCCER ELECTRICAL MODULE 26103-
20 QUESTIONS WITH CORRECT
ANSWERS LATEST UPDATE 2026
An electrical circuit contains, at minimum 3 components to carry the electrical current. The circuit should also have a means to stop and start the current, such as a switch. - correct answer- Voltage source, a load and conductors (wires) The atom is the smallest part of an element that enters into a chemical change, but it does so in the form of a _____ particle. - correct answer-Charged The term ___ can be taken to mean a quantity of electricity that is either positive or negative. - correct answer-Charge A hydrogen atom is composed of a nucleus containing one proton and a single orbiting electron. As the electron evolves around the nucleus, it is held in this orbit by two counteracting forces. One of these forces is called ___ force, which is the force that tends to cause the electron to fly outward as it travels around its circular orbit. The second force acting upon the electron is ___ force,
which pulls the electron towards the nucleus. - correct answer- Centrifugal, Electrostatic A proton (+) ____ another proton (+) - correct answer-Repels An electron (-) ___ another electron (-) - correct answer-Repels A proton (+) ___ an electron (-) - correct answer-Attracts The difference between atoms, with respect to chemical activity and stability, depends on the ___ and ___ of the electrons included within the atom. In general, the electrons reside in groups of orbits called shells. The shells are arranged in steps that correspond to fixed energy levels. - correct answer-Number and position The outer shell of an atom is called the valence shell, and the electrons contained in this shell are called valence ___. - correct answer-electrons
Usually, a ___ has three or or fewer valence electrons - correct answer-Conductor An ___ has five or more valence electrons. - correct answer- Insulator A ___ has four valence electrons. - correct answer- Semiconductor Germanium and silicon are examples of ____. - correct answer- Semiconductors The operation of many electrical components relies on the power of ____. Motors, relays, transformers, and solenoids are examples. - correct answer-Magnetism Electricity also produces magnetism. Current flowing through a conductor produces a small magnetic field around the conductor.
Electricity comes from electrical generating plants operated by utilities like your local power company. Steam from ____, or _____ is used to power huge generators called turbines, which generate electricity. - correct answer-Coal-burning, nuclear power plants The electrical power that travels through long distance transmission lines may be as high as ______ V. - correct answer- 750, The voltage you receive at home is usually about ___ V. - correct answer- 240 An atom with seven valence electrons is most likely a(n) ____. - correct answer-Insulator Current flowing through a conductor coiled around an iron bar produces a(n)____. - correct answer-Electromagnet
An electrical charge has the ability to do the work of moving another charge by _____ or ____. - correct answer-Attraction, repulsion The ability of a charge to do work is called its ____. - correct answer-Potential When one charge is different from another, there is a difference in potential between them. The ____ of the difference of potential of all the charges in the electrostatic field is referred to as the potential difference, electromotive force (EMF) , or voltage. - correct answer-Sum ____ is directly related to the ability of a material to conduct electricity. - correct answer-Resistance All conductors have very ___ resistance; insulators have very ____ resistance. - correct answer-Low, High
Resistance can be defined as the opposition to current flow. To add resistance to a circuit, electrical components called ____ are used. - correct answer-Resistors A resistor is a device whose resistance to current flow is known, specified value. Resistance is measured in ____ and is represented by the symbol R is equations. - correct answer-Ohms The resistance of a wire is proportional to the ___ of the wire, inversely proportional to the ___ area of the wire and dependent upon the kind of material which the wire is made. - correct answer-Length, /cross-sectional A mil equals ____ inch; a circular mil is the cross-sectional area of a wire one mil in diameter. - correct answer-0. Current- the current in a circuit is equal to the voltage applied to the circuit divided by the resistance of the circuit: - correct answer-I=E/R
Find the applied voltage when the current is 30A and the resistance is 4 Ohms. - correct answer-120 V The function of a resistor is to offer a particular resistance to current flow. For a given current and known resistance, the change in voltage across the component, or ____ , can be predicted using Ohm's law. - correct answer-Voltage drop The two most common electronic resistors are ____ and ____ composition construction. - correct answer-Wire-wound, carbon A typical wire-wound resistor consist of a length of ____ wire on a ceramic ube and covered with porcelain. - correct answer-Nickel Carbon composition resistors are ____ and less expensive than the wire-wound type. However, the wire-wound type is the more rugged of the two and is able to survive much larger power dissipations than the carbon composition type. - correct answer- Smaller
A ____ resistor consists of a coil of closely wound insulated resistance wire formed into a partial circle. The coil has a low- resistance terminal at each end, and a third terminal is connected to a movable contact with a shaft adjustment facility. - correct answer-Variable True or False? The movable contact in a variable resistor can be set to any point on a connecting track that extends over one (uninsulated) edge of the coil. - correct answer-True Because carbon composition resistors are small in size- some less than 0.4 inch (1cm) long- it is not convenient to print the resistance value on the side. Instead, a ____ code in the form of a band is used to identify the resistance value and tolerance. - correct answer-Color Starting from one end of the resistor, the first two band identify the first and second digits of the resistance value, and the third band indicates the number of zeros. An exception to this is when the third band is either ____ or ____ , which indicates a 0.01 or 0. multiplier, respectively. - correct answer-silver, gold
Unlike series circuits, parallel circuits ____ working even if one circuit opens. Household circuits are wired in parallel; in fact, almost all circuits you encounter will be parallel circuits. - correct answer-continue Electronic circuits sometimes contain a hybrid arrangement known as a ______ circuit. However, you will rarely find loads connected in this arrangement. - correct answer-Series-parallel Electricians frequently use test meters to measure voltage, current, and resistance. The most common type of meter is the volt-ohm-milliameter (VOM) also called a _____. - correct answer- Multimeter Multimeters are commonly used to measure AC and DC voltage, DC current, and resistance. They can also be used to measure AC current in the milliamp range. For larger current values, it is usually necessary to use a _____ ammeter. - correct answer- Clamp-on A ____ must be connected in parallel with (across) the component to be tested. If a circuit function is not operating you
will be able to determine if the correct voltage is available to the circuit. Voltage must be check with power applied. - correct answer-voltmeter An ____ contains an internal battery that acts as a voltage source. Therefore, resistance measurements are always made with the system power shut off. Sometimes, its used to measure resistance in a load; motor windings are a good example. More often than not it is used to check continuity in a circuit. - correct answer-Ohmmeter To test the ____ of a wire, strip the insulation off one end of the wire , then connect the wire to the metal conduit. At the end of the conduit run, clip the alligator clip lead of the tester to the conduit and touch the probe to the end of the wire under the test. - correct answer-continuity When one ampere flows through a difference of two volts, two watts of power must be used. In other words, the number of watts used is equal to the number of amperes of current times the potential difference. This is called the _____ and is expressed as P= I X E - correct answer-Power equation
A) Gold B) Copper C) Silver D) Porcelain - correct answer-(D) Porcelain The voltage commonly supplied to a residence by the local utility company ____. - correct answer-240V Current is measured in units called ____. - correct answer- Amperes Joules are _____. A) units of work B) the potential difference between two points C) the difference between EMF and current D) the rate of current flow - correct answer-A) units of work Another term used for voltage is ____. - correct answer-EMF( electromotive force )
All conductors have ____. - correct answer-some resistance In order to calculate the current flowing in a circuit _____. - correct answer-Divide voltage by resistance (I= E/R) The color band that represents tolerance on a resistor is the ____.
- correct answer-4th band In a parallel circuit, the total resistance is ____ the smallest resistance. - correct answer-Less than Ammeters measure ___. - correct answer-Current Circuit continuity is checked using the ____ function of a multimeter. - correct answer-Ohmmeter resistance is measured in ___. - correct answer-Ohms
