Test 1: Static Electricity

Question 1

Electric Discharge

Answer 1

The rapid transfer of electric charge (electrons) from one object to another (aka spark)

Question 2

What are the three laws of electric charges

Answer 2

1.Opposite charges attract
2. Like charges repel
3. Neutral objects are attracted to charged objects

Question 3

Which direction do electrons flow when a positive vs negatively charged object is grounded?

Answer 3

Positive: electrons go up
Negative: Electrons go down

Question 4

Examples of conductors, what is it?

Answer 4

A conductor allows charge (electricity) to flow through it,
Examples:
-Steel
-Copper
-Aluminium
-Silver

Question 5

Examples of insulators, what is it?

Answer 5

An insulator does not allow electric current to flow through it freely, although it can hold charges by friction, and has mostly fixed atoms
Examples:
-Plastic
-Wood
-Rubber
-Glass

Question 6

How do you make something positive or negative?

Answer 6

To make an object positive, you remove electrons. To make it negative, you add electrons

Question 7

Electroscopes

Answer 7

is a device that detects electricity and shows electric charge with movement

Question 8

How to permanently charge an object with induction

Answer 8

By grounding it

Question 9

Two types of induction

Answer 9

Grounding: Permanent
Induced Charge Separation: Temporary

Question 10

Why is static electricity worse in the winter

Answer 10

When it’s colder outside our housing is warmer, making it drier, so there is more static electricity. water molecules get in the way and help manage friction

Question 11

Explain electric discharge using a wool carpet, human skin, and a metal doorknob

Answer 11

When you walk on the wool carpet, the electrons from ur body go to the carpet so it makes the carpet negatively charged and makes you positively charged. when. u reach to touch the doorknob (metal is a conductor so the electrons are loosely bound) the electrons from the doorknob jump into ur hand giving an electric discharge spark

Question 12

What are the parts of a van de graaf machine

Answer 12

dome, rubber belt, metal comb 2x, motor, plastic pulley

Question 13

What are the parts of a van de graaf machine

Answer 13

dome, rubber belt, metal comb 2x, motor, plastic pulley

Question 14

what charge builds up on a van de graaf machine

Answer 14

positive

Question 15

why does a van de graaf generator make ur hair stand up

Answer 15

because since like charges repel, ur hair is all charged the same so they try to get away from each other, causing ur hair to separate and stand up

Question 16

how does an electrostatic paint gun work

Answer 16

the paint is charged negatively while the object is charged positively. when this happens the paint spreads out across the object smoothly and perfectly avoiding clumps. ford uses this method to paint its cars

Question 17

bounce sheets

Answer 17

1. neutralize charges to reduce static electricity
   2.reduces friction by layering fabric with a thin layer of wax
   3.by reducing charge buildup , it prevents static discharge
2. sometimes used in air filters to help attract dust particles
3. clothes become dull after a while because of the wax

Question 18

theory of lightning

Answer 18

1. updraft of warm moist air
2. water vapor turns to droplets
3. some droplets freeze
4. droplets and ice crystals collide with friction and gains their charge
5. updraft carries the ice crystals up and the droplets go to the bottom of the cloud
6. cloud to ground lighting (electric discharge)

Question 19

theory of lightning

Answer 19

1. updraft of warm moist air
2. water vapor turns to droplets
3. some droplets freeze
4. droplets and ice crystals collide with friction and gains their charge
5. updraft carries the ice crystals up and the droplets go to the bottom of the cloud
6. cloud to ground lighting (electric discharge)