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Worksheets(Unit #3) Delmar's Standard Textbook of Electricity: Quiz
Total questions: 22
Worksheet time: 2hrs 50mins
Copy machines operate on the principle of static electricity.
True
False
Lightning is the result of static charges built up in clouds that contain a large amount of moisture.
True
False
A thundercloud contains only positive electric charges.
True
False
Most lightning discharges associated with a cloud occur between the cloud and the ground.
True
False
Current always flows from positive to negative.
True
False
Lightning rods provide an easy path to ground for current.
True
False
A precipitator is a type of?
Lightning Rod
Power Supply
Small Wire
Air Filter
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?
Positive Charge
Neutral Charge
Negative Charge
I don't know...
Static electricity refers to electrons that (are / are not) moving.
(a)
Insulators are the only materials that can hold (electrons / elements) stationary.
(a)
Electrostatic charges occur on?
Insulators
Conductors
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 (same / opposite) polarity as the electroscope charge.
(a)
Within a lightning bolt, current flows?
In both directions.
From positive to negative.
From negative to positive.
I don't know...
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.
Catcher
Arrestor
Rod
Umbrella
If a thundercloud has a positive charge, the current in the lightning bolt will flow from the?
Cloud to the ground.
Ground to the cloud.
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?
Arrestor
Rod
Catcher
Umbrella
The shock that results from walking across a carpet and touching a doorknob is an example of a(n) (useful / nuisance) static charge.
(a)
In a clothes dryer, the greatest static charges generally are built up on?
Man-Made Fabrics
Natural Fabrics
The static charge sometimes used during spray painting is an example of a(n)?
Nuisance Static Charge
Useful Static Charge
Selenium is a(n)?
Conductor
Insulator
Semiconductor
I don't know...
The semiconductor material used as a coating on copy machine drums is?
Aluminum
Selenium
Germanium
Silicon
An electroscope can be used to determine the polarity of an electrostatic charge.
True
False
