Deck 3: Static Electricity

Question 1

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

Answer 1

True

Question 2

Lightning rods provide an easy path to ground for current.

Answer 2

True

Question 3

Current always flows from positive to negative.

Answer 3

False

Question 4

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

Question 5

Selenium is a(n) .

A) conductor
B) insulator
C) semiconductor

Question 6

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

A) nuisance
B) useful

Question 7

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

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 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 10

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

Question 11

A precipitator is a type of .

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

Question 12

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

Question 13

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 14

Static electricity refers to electrons that moving.

A) are
B) are not

Question 15

Insulators are the only materials that can hold stationary.

A) elements
B) electrons

Question 16

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 17

A thundercloud contains only positive electric charges.

Question 18

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

A) man-made
B) natural

Question 19

Within a lightning bolt, current flows .

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

Question 20

Electrostatic charges occur on .

A) conductors
B) insulators

Question 21

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

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

Question 22

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

Question 23

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