3 Fundamentals of Electricity: Unit 3 - Static Electricity
Nuisance static charges are more likely to occur when the air is _____.
dry (low humidity)
Most _____ _____ occur within the cloud.
lightning discharges (lightning bolt)
The object to be painted has a _____ charge.
negative
If you walk across a carpet, touch a doorknob and get a shock, the shock was the result of a _____ static charge.
nuisance
The semiconductor material used as a coating on copy machine drums is _____.
selenium
Lightning rods work by providing a _____ _____ to ground for current flow.
easy path
Electrostatic charges are built up on _____ material.
insulator
Electrostatic charges occur on _____ _____.
insulator material
A static electric charge is an electric charge which _____ _____ moving.
is not
The current flow that occurs within a lightning bolt flows _____ to _____.
negative to positive
A static discharge from a persons body can cause a _____ _____.
painful shock
Protecting objects from lightning strikes can be done by connecting a conductor from the earth to a piece of metal usually mounted on the roof of a building. The piece of metal is called a lightning _____.
rod
Some everyday objects and processes utilize static charges. These charges can be called useful static charges. In a copy machine during the copy process, the drum is charged in specific areas. The toner sticks to the drum in areas that _____ _____ charged.
are positively
A lightning bolt has an average voltage of about ____ volts.
15,000,000
If a thunder cloud has a positive charge, the current in the lightning bolt will flow from the _____ _____.
ground up
Lightning arrestors have _____ resistance until voltage rises.
high
Man made fabric s are better _____ than cotton or wool.
insulators
If an object has a lack of electrons it has a _____ charge.
positive
Lightning arresters are an open circuit prior to a lightning strike. During the lightning strike, an arc is created. This arc is like a _____ circuit.
short
Static electricity is often used in _____ _____.
spray paint
When _____ _____ occurs in nature it can be harmful.
static electricity
The static charge sometimes used during spray painting is called a _____ static charge.
useful
_____ is without a doubt the greatest display of static electric discharge.
Lightning
The _____ uses a high voltage DC power supply to provide a set of wires with a negative charge.
Precipitator
Lightning rods were invented by _____ _____.
Ben Franklin