Deck 3: Static Electricity

Question 1

The shock that results from walking across a carpet and touching a doorknob is an example of a(n) _____ static charge.

A) nuisance
B) useful

Answer 1

A

Question 2

Bringing a charged test object near the ball of a charged electroscope causes the leaves to move closer together. This indicates that the test object charge is the _____ polarity as the electroscope charge.

A) same
B) opposite

Answer 2

B

Question 3

A precipitator is a type of _____.

A) air filter
B) lightning rod
C) small wire
D) power supply

Answer 3

A

Question 4

An electroscope can be used to determine the polarity of an electrostatic charge.

Question 5

Copy machines operate on the principle of static electricity.

Question 6

The precipitator uses a high-voltage DC power supply to provide a set of wires with a positive charge and a set of plates with a _____ charge.

A) negative
B) positive
C) ​neutral

Question 7

Insulators are the only materials that can hold _____ stationary.

A) elements
B) electrons

Question 8

When an object protected by a lightning _____ is struck by a lightning bolt, it will bleed the lightning discharge to ground before the protected object can be harmed.

A) arrestor
B) umbrella
C) catcher
D) rod

Question 9

The static charge sometimes used during spray painting is an example of a(n) _____ static charge.

A) nuisance
B) useful

Question 10

Static electricity refers to electrons that _____ moving.

A) are
B) are not

Question 11

A thundercloud contains only positive electric charges.

Question 12

Lightning rods provide an easy path to ground for current.

Question 13

Lightning is the result of static charges built up in clouds that contain a large amount of moisture.

Question 14

If a thundercloud has a positive charge, the current in the lightning bolt will flow from the _____.

A) ground to the cloud
B) cloud to the ground

Question 15

Electrostatic charges occur on _____.

A) conductors
B) insulators

Question 16

Current always flows from positive to negative.

Question 17

Within a lightning bolt, current flows _____.

A) from positive to negative
B) from negative to positive
C) in both directions

Question 18

In a clothes dryer, the greatest static charges generally are built up on _____ fabrics.

A) man-made
B) natural

Question 19

Most lightning discharges associated with a cloud occur between the cloud and the ground.

Question 20

A lightning protection device that is grounded at one end, with the other end close to but not touching the object to be protected, is called a lightning _____.

A) arrestor
B) catcher
C) umbrella
D) rod

Question 21

Selenium is a(n) _____.

A) conductor
B) insulator
C) semiconductor

Question 22

The semiconductor material used as a coating on copy machine drums is _____.

A) aluminum
B) germanium
C) selenium
D) silicon

Question 23

Power lines are often protected by lightning _______________ that exhibit a very high resistance at the normal voltage of the line.

Question 24

Nuisance static charges are more likely to occur when the air is _______________.