voltage-and-current electronics question and answers -Page 2

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Voltage and Current problems

1. An atom's atomic number is determined by the number of:
Options
A. neutrons minus protons
B. protons
C. electrons
D. neutrons

Discuss

Correct Answer: protons

2. A basic electric circuit is made up of what components?
Options
A. A load, a resistor, and a conductive path for current
B. A voltage source, a load, and a conductive path for current
C. A voltage source, a conductive path for current, and a battery
D. A conductive path for current, a battery, and a copper wire

Discuss

Correct Answer: A voltage source, a load, and a conductive path for current

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

Discuss

Correct Answer: electron and proton

4. Material that consists of a mixture of elements is considered to be:
Options
A. an element
B. an ion
C. a compound
D. a molecule

Discuss

Correct Answer: a compound

5. What is the color code for a 220 Ω 5% resistor?
Options
A. Red, Red, Brown, Gold
B. Orange, Orange, Black, Gold
C. Red, Red, Black, Gold
D. Red, Red, Brown, Silver

Discuss

Correct Answer: Red, Red, Brown, Gold

Explanation:

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).