Resistor Quiz Questions
What is a resistor?
A: It's a passive two-terminal electrical component that provides electrical
resistance in a circuit.
Resistors act to reduce what?
A: Current flow.
Resistors also act to lower what within circuits?
A: Voltage levels.
In electronic circuits resistors have many potential uses
such as what?
A: Limit current flow, to adjust signal levels, bias active elements and more.
High-power resistors that can dissipate many "what" are
necessary in many applications?
A: Watts.
Resistors can have fixed resistances that only change
slightly with what?
A: Temperature, time or operating voltage.
Variable resistors can be used to adjust what?
A: Circuit elements such as a volume control or a lamp dimmer.
Resistors can also be used as sensing devices for what?
A: Heat, light, humidity, force, or chemical activity.
Practical resistors as discrete components can be composed
of various what?
A: Compounds and forms.
Resistors are also implemented within what type of
circuits?
A: Integrated circuits.
The electrical function of a resistor is specified by its
what?
A: Resistance.
Commercial resistors are manufactured over a range of more
than how many orders of magnitude?
A: Nine.
The hydraulic analogy compares electric current flowing
through circuits to what?
A: Water flowing through pipes.
When a pipe is filled with hair, it takes a larger pressure
to achieve the same flow as a pipe with what?
A: No hair.
Pushing electric current through a large resistance is like
pushing water through a pipe clogged with hair: It requires a larger push, or
higher what?
A: Voltage.
The behavior of an ideal resistor is dictated by the
relationship specified by what law?
A: Ohm's law:
Practical resistors also have some what?
A: Inductance and
capacitance, which can affect voltage and current in
alternating current circuits.
What is the symbol for the SI unit of electrical
resistance?
A: The ohm (symbol: Ω).
Who was the ohm named after?
A: George Simon Ohm.
An ohm is equivalent to what?
A: A volt per ampere.
The total resistance of series connected resistors is
what?
A: The sum of their individual resistance values.
The total resistance of resistors connected in parallel is
what?
A: The reciprocal of the sum of the reciprocals of the individual resistors.
Resistors are rated according to their maximum what?
A: Power dissipation.
How are most discrete resistors in solid-state electronic
systems typically rated?
A: As 1/10, 1/8, or 1/4 watt.
Resistors required to dissipate substantial amounts of
power are generally referred to as what?
A: Power resistors.
What might happen if the average power dissipated by a
resistor is more than its power rating?
A: Damage to the resistor may occur.
Too much power dissipation can raise the temperature of the
resistor high enough to what?
A: Burn the circuit board or adjacent components, or even cause a
fire.
Practical resistors have a series inductance and a small
what?
A: Parallel capacitance.