Unit 1 - Review Questions

When rounded to the nearest tenth .1153 will be what?

.1

When rounded to the nearest one hundredth .1254 will be what?

.13

1/4 expressed as a decimal is what?

.25

The K is abbreviated for kilo which means what?

1,000

The square root of 49 is equal to what?

7

3/4 expressed as a percentage is what percent?

75

The volume of an enclosure is expressed in what?

In^3 (cubic inches)

When calculations require you to square a number it means to multiply the number by what?

Itself

The reciprocal of a number is obtained by what? A. Showing the number as a fraction by placing it over 1 B. Inverting the top and bottom numbers of the fraction C. Converting the fraction to a decimal by dividing the top number by the bottom number D. All of these

D. All of these

Electricity is the movement of what from the power source through a conductive path and back to the power source?

Electrons

According to Ohm's law, the intensity of the circuit (what we call current) is inversely proportional to the voltage applied and directly proportional to the resistance. (T/F)

False

To change a percent value to a decimal drop the percent symbol and move the decimal point to places to the right. (T/F)

False

When doing a mathematical calculation you can always assume the answer is correct if a calculator was used. (T/F)

False

In a math problem what are used to group steps of a mathematical equation together?

Parentheses

Resistance to the flow of electricity in a circuit is created by what?

Power supply, circuit wiring, and load

A fraction can be converted to A decimal with a calculator by dividing the numerator (top number of the fraction) by the denominator (bottom of the fraction) (T/F)

True

Failure to use correct units of measurement in a calculation can result in a higher or lower value than intended. (T/F)

True

Fractions can be expressed as a decimal number and represent part of a whole number while using the decimal system (T/F)

True

OHM's law, which identifies the relationship current (I), voltage (E), and resistance (are), is expressed by these formulas (E=IxR), (I=E/R), (R=E/I). (T/F)

True

Ohm's law expresses the relationship between the circus current intensity (I), the applied electromotive force (E), and the resistance (R). (T/F)

True

The decimal system places numbers to the right of a decimal point to indicate values that are a fraction of "one". (T/F)

True

The square root of a number is the number when multiplied by itself results in the original number. (T/F)

True

Triangles are used in everything from bending raceways to calculating face angles for sizing power factor correction capacitors. (T/F)

True

When a number must be multiplied by a percentage convert the percentage to a decimal (multiplier) then multiply the original number by the multiplier (decimal value). (T/F)

True

When one of the three inside angles of a triangle is a 90° angle it's called a right angle. (T/F)

True

Whenever numbers are in parentheses complete the mathematical function within the parentheses before proceeding with the remainder of the problem. (T/F)

True

An electrical power source supplies the energy needed to move what out of an atom's orbitals causing them to flow from the power source through a circuit and back again to the power source?

Valence electrons