Part 1: Fill in the Blanks and Definitions

n  The outer shell of an atom is called the __________________ shell.  valence

n  The flow of electrons is called _____________________ current

n  The charge of 6.14 x10¹⁸ electrons is called a ____________________ coulomb

n  The unit of measurement for current is the __________________ ampere

n  __________________ is the force that moves electrons in a circuit  voltage

n  __________________ is a general name for materials with high resistance  Insulators

n  __________________ is a general name for materials with low resistance conductors

n  Write the symbol or letter for the following items in the space provided

n  ___________________ charges attract  unlike

n  ___________________ charges repel  like

n  One amp is the amount of current that flows in a conductor when one ____________ of charge moves past a point in one second.  coulomb

n  List the 2 basic types of cells below

    Ø   ________________________________

    Ø   ________________________________

primary and secondary

Cells that can be recharged are called ________________________________ cells  secondary

n  The text discussed the 6 most common voltage sources. List any 4 of them

    Ø   ________________________________

    Ø   ________________________________

    Ø   ________________________________

    Ø   ________________________________

friction, magnetism, chemical, light, heat, pressure

n  What is the name of the instrument used to measure 

    Ø   Resistance: ________________________________  Ohmmeter

    Ø   Current: ___________________________________  Ammeter

    Ø   Voltage: ___________________________________  Voltmeter

n  What is the name of the instrument that can measure all of the above?______________________  multimeter

n  A resistor's ______________________ is the amount that it may vary and still be acceptable.  tolerance

The text discussed two different ways in which a resistor can be identified. List these 2 ways below

    Ø   ______________________________________________________  color code

    Ø   ______________________________________________________  alpha numeric system

n  For each of the following, indicate whether the instrument is connected in series with the item being

     measure or in parallel (your answer should be either series or parallel).

    Ø   Resistance: ________________________________  Parallel

    Ø   Current: ___________________________________  Series

    Ø   Voltage: ___________________________________  Parallel

n  A way to measure current that does not require opening the circuit is to use a resistor of known

    value in the circuit. Such a resistor is called a (an)  _____________________________________   ammeter shunt.

n  The testing for an open, closed, or short circuit is called a _____________________ check.  continuity

n  DMM is better for testing semiconductors than VOM. Indicate below what each of these acronyms stand for.

    Ø   DMM: ________________________________  Digital Multimeter

    Ø   VOM: ________________________________  volt-ohm-milliammeter

n  ______________________ meters use a graduated scale with a pointer.  Analog

n  ______________________ meters use a direct readout.  Digital

n  List the 2 types of ground discussed in the text.

    Ø   ________________________________

    Ø   ________________________________

earth, electrical

n  _________________ produces the energy to dislodge electrons from their orbit.  voltage

n  Cells that cannot be recharged are called _____________________ cells primary

n  A battery is a combination of 2 or more _______________  cells

n  Resistors are either __________________ or __________________ fixed, variable

n   Variable resistors used to control current are called _________________ rheostats

n   The relationship of current, voltage, and resistance is given by _______________ law.  Ohm's

n   The symbol on a battery in a circuit that is used to indicate the side with a surplus of electrons is ______________ -

n   The symbol on a battery in a circuit that is used to indicate the side with a deficiency of electrons is ______________ +

n   A _______________________________ is used to generate electricity by means of friction Van de Graaf Generator

n   Current that flows in one direction and then the other is called ___________________________  alternating current

n   Current that flows in one direction only is called ___________________________ direct current.

n   A device used to convert light energy into electrical energy is called a ______________________  photovoltaic cell

n   The ______________________ marking on a resistor is used to indicate the amount that a resistor's value may vary and still be acceptable.     tolerance

n   A picture of _______________________ is on the first page of this exercise. His contributions have been discussed many times; an abbreviated bio is on my site along with his picture.

      Ben Franklin

n   The unit of difference of potential  is named in honor of Allessandro _________________  Volta

n   The unit of current is named after Andre-Marie ______________________________  Ampere

n   The unit of resistance is named after Georg Simon _____________________ ohm

n   Clearly state Kirchoff's current law - in words

The total current flowing into a junction is equal to the sum of the current flowing out of the junction.

n   The basic unit of power is the ____________________________ watt

n   Clearly state Kirchoff's voltage law -  in words

The sum of all the voltage drops in a closed circuit will equal the voltage source.

n   Define a junction.

Place in a circuit where the current has a choice of 2 or more paths on which to travel.

n   What is the current in amps if 15 coulombs of current flows past a point in an electric circuit in 5 seconds?

3 coulombs/second = 3 amps

The unit of conductance is the _____________________ mho