Delmar Unit 3
When an object protected by a lightning ___ is struck by a lightning bolt, it will bleed the lightning to ground before the protected object can be harmed?
Arrestor
Nuisance static charges are more likely to occur when the air is?
Dry
Lightning rods provide an ___ to ground for current?
Easy path
Insulators are the only materials that can hold a ___ stationary?
Electrons
If a thundercloud has a positive charge, the current in the lightning bolt will flow from the ___ to ___?
Ground to the cloud
The best way to remove a static charge from an object?
Grounding wire
Electrostatic charges occur on?
Insulators
The semiconductor material used a s a coating on copying machines is?
Selenium
MOV particles in a lightning arrestor is a what?
Semiconductor
A copy machine operates on the principle of?
Static Electricity
Name the four paths of a lightning bolt in order of occurrence?
Within the cloud Cloud to cloud Cloud to ground Ground to cloud
Most lightning discharges associated with clouds occur?
Within the clouds
A precipitator is a type of?
Air filter
Lightning discharges usually occur from ___ polarity to ___ polarity?
Negative / Positive
A thundercloud contains only ___ electrical charges?
Negative and positive
Static electricity refers to electrons that are?
Not moving
Selenium in a copy machine is sensitive to?
Light
Selenium is a what?
Semiconductor
An electroscope can be used to determine ___ of an electrostatic charge?
Polarity
Static charges used during spray painting is an example of a ___ static charge?
Useful
The shock that results from walking across a carpet and touching a doorknob is an example of ___ static charge?
Nuisance
Within a lightning bolt, current flows?
- to +
In a clothes dryer, the greatest static charges generally are built up on ___ fabrics?
Man-made
Lightning is the result of static charges built up in clouds that contain a large amount of ___?
Moisture
The precipitator uses a high DC power supply to provide a set of wires with a positive charge and a set of plates with a ___ charge?
Negative
A lightning bolt is approximately how many volts?
15,000,000
