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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.