Concepts of DC Final Exam Review questions with verified answers || || || || || || || || ||
how many color bands are used on resistors that have a tolerance of +/- 20 percent?
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a) 3
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b) 4
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c) 5
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d) 6 - ✔✔a) 3
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the amount of ____ across a resistor is proportional to its resistance
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a) voltage drop
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b) voltage rise
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c) current drop
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d) current rise - ✔✔a) voltage drop
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what device is designed to open and disconnect a circuit in the event of excessive current?
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a) fuse
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b) power supply
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c) wire
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d) potentiometer - ✔✔a) fuse
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conventional current flow theory states that current flows from the most.....
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a) positive point to the most negative
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b) negative point to the most positive - ✔✔a) positive point to the most negative
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in a series circuit the sum of the voltage drops is _____ the applied voltage
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,a) greater than
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b) less than
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c) equal to
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d) unrelated to - ✔✔c) equal to
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in a parallel circuit the total current flow is equal to the ______ of the currents through all the
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branches ||
a) difference
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b) average
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c) sum
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d) quotient - ✔✔c) sum
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When a circuit has only one path, the _____ is the same at any point.
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a) voltage
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b) current
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c) power
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d) resistance - ✔✔b) current
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the amount of current flowing in a series circuit through each resistor is directly proportional
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to individual resistance values
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true ||
false - ✔✔false || ||
By observing the direction of current flow through the circuit, voltage _____ can be
|| || || || || || || || || || || || || ||
determined.
a) drop
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b) polarity - ✔✔b) polarity
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, a series circuit has 2 resistors that dissipate 10w and 15w respectively. what is the total power
|| || || || || || || || || || || || || || || || ||
dissipation of the circuit || || || ||
a) 10w|| ||
b) 5w ||
c) 25w||
d) 15w - ✔✔c) 25w
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what part of an atom has no charge
|| || || || || || ||
a) quark
|| ||
b) neutron
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c) proton
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d) electron - ✔✔b) neutron
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what is another term for a variable resistor
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a) potentiometer
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b) wire wound resistor
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c) metal film resistor - ✔✔a) potentiometer
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a complete circuit is often referred to as a ____ circuit
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a) closed
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b) open||
c) shorted
||
d) grounded - ✔✔a) closed
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how many color bands are used on resistors that have a tolerance of +/- 20 percent?
|| || || || || || || || || || || || || || ||
a) 3
||
b) 4
||
c) 5
||
d) 6 - ✔✔a) 3
|| || || ||
the amount of ____ across a resistor is proportional to its resistance
|| || || || || || || || || || || ||
a) voltage drop
|| || ||
b) voltage rise
|| ||
c) current drop
|| || ||
d) current rise - ✔✔a) voltage drop
|| || || || || ||
what device is designed to open and disconnect a circuit in the event of excessive current?
|| || || || || || || || || || || || || || || ||
a) fuse
|| ||
b) power supply
|| || ||
c) wire
|| ||
d) potentiometer - ✔✔a) fuse
|| || || ||
conventional current flow theory states that current flows from the most.....
|| || || || || || || || || ||
a) positive point to the most negative
|| || || || || || ||
b) negative point to the most positive - ✔✔a) positive point to the most negative
|| || || || || || || || || || || || || ||
in a series circuit the sum of the voltage drops is _____ the applied voltage
|| || || || || || || || || || || || || ||
,a) greater than
|| ||
b) less than
|| ||
c) equal to
|| || ||
d) unrelated to - ✔✔c) equal to
|| || || || || ||
in a parallel circuit the total current flow is equal to the ______ of the currents through all the
|| || || || || || || || || || || || || || || || || || ||
branches ||
a) difference
|| ||
b) average
|| ||
c) sum
||
d) quotient - ✔✔c) sum
|| || || ||
When a circuit has only one path, the _____ is the same at any point.
|| || || || || || || || || || || || || ||
a) voltage
||
b) current
|| ||
c) power
|| ||
d) resistance - ✔✔b) current
|| || || ||
the amount of current flowing in a series circuit through each resistor is directly proportional
|| || || || || || || || || || || || || || ||
to individual resistance values
|| || ||
true ||
false - ✔✔false || ||
By observing the direction of current flow through the circuit, voltage _____ can be
|| || || || || || || || || || || || || ||
determined.
a) drop
|| ||
b) polarity - ✔✔b) polarity
|| || || ||
, a series circuit has 2 resistors that dissipate 10w and 15w respectively. what is the total power
|| || || || || || || || || || || || || || || || ||
dissipation of the circuit || || || ||
a) 10w|| ||
b) 5w ||
c) 25w||
d) 15w - ✔✔c) 25w
|| || || ||
what part of an atom has no charge
|| || || || || || ||
a) quark
|| ||
b) neutron
|| ||
c) proton
||
d) electron - ✔✔b) neutron
|| || || ||
what is another term for a variable resistor
|| || || || || || || ||
a) potentiometer
||
b) wire wound resistor
|| || || ||
c) metal film resistor - ✔✔a) potentiometer
|| || || || || ||
a complete circuit is often referred to as a ____ circuit
|| || || || || || || || || || ||
a) closed
|| ||
b) open||
c) shorted
||
d) grounded - ✔✔a) closed
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