Electrical Components

Question 1

a material that loses all its electrical resistance at temperature near absolute zero

Answer 1

superconductor

Question 2

a resistor with a resistance that cannot change

Answer 2

fixed resistor

Question 3

rate of energy production or consumption

Answer 3

power

Question 4

variable resistor having high resistance

Answer 4

potentiometer

Question 5

variable resistor having a low resistance

Answer 5

rheostat

Question 6

device that can store electric charge

Answer 6

capacitor

Question 7

unit of capacitance

Answer 7

farad

Question 8

coil of wire with a movable magnetic core

Answer 8

Solenoid

Question 9

magnetic effect that occurs in a coil of wire when the current changes

Answer 9

induction

Question 10

a switch that operates by electricity

Answer 10

relay

Question 11

components that add resistance to a circuit are called

Answer 11

resistors

Question 12

the rate of heat production is proportional to the product of the _________ across the resistor and the ______ passing through it.

Answer 12

potential difference

current

Question 13

fixed resistor sometimes have one or more connections, called

Answer 13

taps

Question 14

to read a the resistor color code, you start with the band at the ______ and read toward the band at the ______.

Answer 14

end

center

Question 15

rheostats and potentiometers both have _______ terminals

Answer 15

three

Question 16

potentmeters and rheostats are both rated according to the amount of _______ they can handle.

Answer 16

power

Question 17

the amount of charge a capacitor can store compared to the potential difference between its terminals

Answer 17

capacitance

Question 18

solenoids and relays are electromagnetic coils used as

Answer 18

transducers

Question 19

a variable capacitor has two sets of plates, one called the _______ and the other called the _______.

Answer 19

rotor

stator

Question 20

when a magnetic field of one coil produces a current or potential difference in another, the effects called

Answer 20

mutual induction

Question 21

the insulation in a capacitor is called a

Answer 21

dielectric

Question 22

capacitance is determined in part by the area of the _____. inside the capacitor

Answer 22

conductive surface

Question 23

two variable capacitors that work together make up a

Answer 23

ganged capacitor