DC Circuits Test 1 Intro-Ch. 2

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The charge of one electron is ______ Coulomb.

.16 x 10^-18

Surface mount resistors have power have power ratings of 1/8 to ____ watt(s)

1/4

The unit of current is the:

Ampere

True or False: An open resistor measures zero ohms.

False

A short circuit can have:

excessive current

A battery:

produces a steady DC voltage

The fifth band in a precision resistor represents the:

tolerance

A neutral dielectric has 18.75 x 10^18 electrons removed. The dielectric now has a net charge of: Hint: 1 Coulomb=6.25 x 10^18

+3 Coulombs

12,000 watts is equal to ______kW

12kW

If an insulator is charged for 3 seconds by 5 amps of current, the charge accumulated will be: Hint: I=Q/T

15 Coulombs

A current of 2000 microamps also equals ________mA

2mA

A charge of 10 Coulombs moves past a given point in 2 seconds. The current flow is: Hint: I=Q/T

5 amperes

The descriptive unit of charge (Q) is the:

Coulomb

True or False: An electron flow rate of one coulomb per second is called a volt.

False

True or False: Resistors have a very limited shelf life.

False

True or False: The larger the American Standard Wire Gauge (AWG) number, the larger the wire diameter.

False

True or False: The most common resistor trouble is a short.

False

True or False: The resistance of a PTC thermistor increases as its operating temperature decreases.

False

True or False: Carbon film and metal film resistors have more precise resistance values than carbon composition resistors.

True

True or False: Four-band resistors under 10 ohms have a third stripe that is either gold or silver.

True

True or False: Insulators prevent current flow.

True

True or False: Rheostats and potentiometers are variable resistors.

True

True or False: The charge of an electron and proton are the same, but the polarity is opposite.

True

True or False: The physical size of a resistor determines its power handling capabilities.

True

True or False: The power rating of a carbon resistor is not affected by the ambient temperature.

True

True or False: The unit of potential difference is the volt.

True

True or False: There are 120 milliamps in 0.12 amps.

True

True or False: Thermistors are normally rated by the value of their resistance at a reference temperature, T of 25*C.

True

True or False: Voltage can exist without current.

True

True or False: When measuring resistance in a circuit, it is important to be sure there are no parallel paths across the resistor being measured.

True

True or False: When working with high-voltage circuits, work with only one hand at a time to prevent electrical shock.

True

Which statement is NOT true? a rheostat can be used as a potentiometer. a potentiometer can be used as a rheostat. a potentiometer is a three-terminal device. a rheostat is a two terminal device.

a rheostat can be used as a potentiometer

The basic building block of matter is the:

atom

Ball A is positively charged to some value. Ball B has twice the positive charged value of A. When the two balls are brought together, there will be a force of ________ because ball A is _______ with respect to ball B.

attraction, negative

A(n) ________ converts chemical energy into electrical energy.

battery

The movement of _____ is called current.

charge

Valence electrons of an atom determine the:

chemical and electrical stability

Gold is classified in electricity as a(n) _________.

conductor

Conventional current flow and electron current flow:

flow in opposite directions

The moving charges that provide current in metal conductors like copper wire are:

free electrons

An ion is an atom that has:

lost or gained one or more valence electrons

A generator produces electricity by converting ________ energy.

mechanical

The smallest unit into which a compound may be divided without altering the characteristics of the compound is a:

molecule

The third digit on a surface mount resistor is the _______ expressed as an exponent.

multiplier

Electrons flowing through an electronic circuit usually encounter opposition to their free movement. The opposition is measured in:

ohms

__________ designates the differences in charges between two points.

polarity

A resistor's physical size is an indicator of it's _______ rating, not its _______ value.

power, resistance

The resistance of a short piece of copper wire is:

practically zero

Chip resistors are also known as:

surface mount resistors

Electrons found in the outermost shell are called _______ electrons.

valence

The unit of electrical power is the:

watt

Energy is the ability to do __________.

work

An open circuit has:

zero current


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