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    voltage and current




    1).
    What is the color code for a 220 omega.gif 5% resistor?
    A   Red, Red, Brown, Gold   
    B   Orange, Orange, Black, Gold   
    C   Red, Red, Black, Gold   
    D   Red, Red, Brown, Silver   
    ANS: A - Red, Red, Brown, Gold 

    Resistor colour coding series:

Black   0 
Brown   1 
Red     2 
Orange  3 
Yellow  4 
Green   5 
Blue    6 
Violet  7  
Gray    8   
White   9 
None    20% 
Silver  10% 
Gold    5% 

Therefore Red, Red, Brown, Gold 
           2    2    101    5% 

 = 22 x 10 = 220 ohm 5% (tolerance)

    2).
    If 60 J of energy are available for every 15 C of charge, what is the voltage?
    A   4 V   
    B   60 V   
    C   15 V   
    D   0.25 V   
    ANS: A - 4 V

    No answer description available for this question

    3).
    An atom's atomic number is determined by the number of:
    A   neutrons minus protons   
    B   protons   
    C   electrons   
    D   neutrons   
    ANS: B - protons

    No answer description available for this question

    4).
    A voltage will influence current only if the circuit is:
    A   open   
    B   insulated   
    C   high resistance   
    D   closed   
    ANS: D - closed

    No answer description available for this question

    5).
    Which resistive component is designed to be temperature sensitive?
    A   Thermistor   
    B   Rheostat   
    C   Potentiometer   
    D   Photoconductive cell   
    ANS: A - Thermistor

    No answer description available for this question

    6).
    What type of switch is this?

    A   push button   
    B   SPST   
    C   DPDT   
    D   SPDT   
    ANS: D - SPDT

    No answer description available for this question

    7).
    Primary batteries, unlike secondary batteries, may be:
    A   charged oncecharged once   
    B   used once   
    C   recharged over and over   
    D   stored indefinitely   
    ANS: B - used once

    Primary batteries (disposable batteries), which are designed to be used once and discarded when they are exhausted.

    Secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times.

    8).
    In practical applications, battery voltage:
    A   is restored as soon as disconnect occurs   
    B   is lowered as the load increases   
    C   may be stored indefinitely   
    D   will be reduced to zero as power is drawn   
    ANS: B - is lowered as the load increases

    No answer description available for this question

    9).
    The negative and positive charge symbols are assigned (in that order) to the:
    A   proton and electron   
    B   electron and proton   
    C   atom and nucleus   
    D   electron and element   
    ANS: B - electron and proton

    No answer description available for this question

    10).
    A voltmeter is used:
    A   to measure current   
    B   in series with the circuit   
    C   in parallel with the circuit   
    D   to measure coulombs   
    ANS: C - in parallel with the circuit

    No answer description available for this question