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43 Cards in this Set

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 What is a comparison of two numbers? Ratio How many steps are there to convert a decimal to a fraction? Three What rule specifies a ratio of 1:2:4 for cement, sand, and aggregates for concrete mix? Rule 42 What is a number expressed as a fraction of 100? Percentage What is the standard metric unit for mass? Gram What is the boiling point of water at sea level? 100° c What is the point where two lines meet to form an angle called? Vertex What tool are angles measured with? Protractor What type of triangle has three sides of different angles? Scalene What is the measurement of a two-dimensional size of a surface called? Area Formula for the area of a rectangle? L x W Formula for the area of a triangle? B x H x .5 Formula for the volume of a rectangular shape? L x W x D What is described as the pushing force behind electricity? Voltage Voltage is calculated by multiplying current and resistance. What is this formula known as? Ohms law What is the actual movement of electrons through a conductor known as? Current What is defined as the opposition of current flow? Resistance What is the unit of measurement for resistance? Ohm What is the rate at which work is done called? Power What is current that flows only in one direction referred to as? Direct current What is a variable resistor used to limit current flow? Rheostat What are the smallest building blocks of matter called? Atoms When atoms combine to form molecules, electrons in the outermost shell are either transfer from one atom to another, or shared between atoms in a process known as what? Covalent bonding What are electrically charged atoms called? Ions What does not allow electricity to readily flow through them and have a very high resistance? Insulators How many amperes could stop a human heart under the right circumstances? .1amps What states that current is directly proportional to the voltage and inversely proportional to the resistance? Ohm’s law What is the most common source of DC power? A battery A battery consist of three main components: positive electrodes, negative electrodes, and what else? Electrolytes What type of batteries are also known as rechargeable batteries, storage batteries, or accumulators? Secondary cells What is current flow direction referred to as? Polarity What type of power source does not have a fixed polarity ? AC power What is the most commons means of producing either single-phase or poly-phase power? AC generators What principle do generators use to produce voltage and current? Electromagnetic induction To produce a voltage you need to have a conductor, magnetic field, and what else? Relative motion What has the ability to store a charge and oppose changes in voltage? Capacitor What is defined as the total opposition to the follow of AC in a circuit? Impedance What is the power used to do work plus the power stored during part of a cycle by inductance and capacitance and then returned to the power source called? Apparent power In an AC circuit what is the power actually used to do work? True power What type of circuit is defined as having more than one current path connected to a common voltage source? Parallel circuit What type of electrical circuit is defined as a circuit that contains more than one path of current flow and at least two resistors in a series in one of the paths? Series parallel What are used in a parallel circuit where three or more conductors meet each other? Junction What provides the physical connection between the power source, overcurrent protection, switch, and the load and provides a return path back through the components so that current can flow back to its place of origin? Conductors