Electronics Resistance
The opposition a device or material offers to the flow of electrical current is:
Resistance
Which measurement should not be attempted in circuits that have power applied?
Resistance
A circuit component specifically designed to oppose the flow of electrical current is a/an:
Resistor
What is the condition of a 10 k Ω resistor with a 20 % tolerance if it reads 8, 100 Ω with an ohmmeter?
good
To accurately measure the resistance of a resistor connected in a circuit, what should be done?
isolate the resistor from the rest of the circuit
What are the color bands for a 39 k Ω resistor?
Orange, white, orange
What is the ohm a measure for?
resistance
Which type of resistor has the HIGHEST power rating?
wire wound
If a 10 k Ω, 20 % resistor measures 9 k Ω with an ohmmeter, the resistor is:
within tolerance
How much voltage can be applied to a circuit when the ohmmeter is being used?
0 V
The resistance value of a four band resistor marked red, black, silver, & gold is:
0.2 Ω 5 %
A four-band resistor with a color code of brown, black, black, gold has a value of:
10 Ω , 5 %
What is the tolerance of a four band resistor with silver in the fourth band?
10%
What is the resistance of a four-band resistor with a color code of brown, black, yellow, & gold?
100 k Ω
A four-band resistor with a color code of red, black, red, silver has a value of:
2 k Ω , 10 %
What is the expected resistance range of a 5 k Ω resistor with a silver tolerance band:
4.5 k Ω − 5.5 k Ω
What is the value of a three-band resistor with a color code of violet, gray, & red?
7.8 k Ω , 20 %
A 100 Ω resistor with a gold tolerance band would have an expected resistance in the range of:
95 Ω − 105 Ω
What are the color bands for a 1200 Ω resistor?
Brown, red, red
What is the sequence of color bands on a 56 k Ω , 10 % resistor?
Green, blue, orange, silver
The unit of resistance is the:
Ohm
Resistors have:
Ohm values and wattage ratings
What electronic instrument is used to measure resistance?
Ohmmeter
What instrument is used to determine the value of a resistor?
Ohmmeter
If a 680 Ω, 10 % resistor measures infinity on an ohmmeter, it is said to be:
Open
The maximum amount of power that a resistor can handle before it overheats is the:
Wattage Rating
What is a resistor specifically designed to do?
limit electric current flow
A circuit with no available path for current to flow is:
open
What does an infinity reading on the ohmmeter indicate about a circuit?
open
If a 500 Ω, 10 % resistor measures 800 Ω with an ohmmeter, the resistor is
out of tolerance
An abnormal connection of relatively low resistance between two points in a circuit is a/an:
short
The wattage of a resistor is generally indicated by it's:
size
The fourth color band on a resistor represents:
tolerance
The percentage above or below that a resistor's value can vary from it's color coded value is called:
tolerance
The maximum amount of electrical power that can safely be applied to a resistor is the:
wattage rating
The physical size of a resistor is related to it's:
wattage rating
Large resistors that are capable of dissipating the heat generated by higher power levels are:
wire wound