Shared Flashcard Set

Details

Science 9
Science 9 final exam review
28
Science
9th Grade
06/15/2013

Additional Science Flashcards

 


 

Cards

Term
The first electrical potential came from what?
Definition
Chemicals (Batteries)
Term
What are the battery parts?
Definition
Electrolytes (acid) and electrodes (metals)
Term
What types of energy are there?
Definition
potential (energy) and kinetic (moving)
Term
How do you measure electrical potential energy?
Definition
With a voltmeter
Term
What are other sources of energy?
Definition

i)                    Friction- result in a small version of lightning

ii)                   Piezoelectric crystals- ex BBQ lighters

iii)                 Photo- electrochemical cells (solar panels)

iv)                 Thermocouple- heat energy converted to electric energy

Generators- large producers of a lot of electricity 

Term
How does electrical current work?
Definition

-movement of electrons

-certain period of time

-closed electric circuit

 

i) Source (ex. Battery, plug…)
ii) conductor (wire)
iii) load (Ex light bulb, motor, etc.)
iv) Switch (on or off)

Term
What do you use to measure current?
Definition
ammeter
Term
How do you figure out the current
Definition
voltage over resistance
Term
What is one amp equal to?
Definition
1 coulomb per second
Term
Series vs. Parallel
Definition

-Series is one path for electrons

-Parallel has multiple paths for electrons

Term
How do you increase resistance?
Definition

-add resistors to a circuit in series

 

-take out parallel resistors

Term
How do you decrease resistance?
Definition

-add resistors in parallel

 

-take out series resistors

Term
What is power?
Definition
Change in energy over a period of time?
Term
What do companies use to calculate cost? (for electricity)
Definition
kilowatts, rather than joules.
Term
How many stars are there to be estimated in our galaxy?
Definition
100 billion stars are estimated in our galaxy alone
Term
How many galaxies are there estimated to be?
Definition
125 billion
Term
What galaxy do we live in?
Definition
The milky way
Term
Chemicals break down to ions, which allows what?
Definition
electricity to flow
Term
What different charges are there?
Definition
positive, negative, neutral
Term
What are the electron levels in each charge?
Definition

Positive- lack of electrons

Negative- buildup of electrons

Neutral- equal amount

Term
What are methods of forming static electricity?
Definition
i) friction
ii) positive: amber loses electrons
iii) negative: acetate gains electrons
Term
Ways of transfering electrons
Definition

i) conductors (metals) -electrons move well

ii) insulators (glass, wood, rubber) -electrons do not move well

 

Term

How do you measure electric charge?

Definition

with coulombs (C)

-1 coulomb= 6.25 x 1018 electrons

-lightning can carry 5-25 coulombs

Term
Different applications of static electricity are...
Definition

i) plastic wrap

ii) photo copier

Term
Dangers of static electricity are...
Definition

i) electrocution (short circuit)

-avoid by grounding

 

Term
What is an electric force?
Definition
push or pull between charged objects (think of magnetic devices)
Term
What types of electric forces?
Definition
opposite charges repel, same charges attract, neutral do nothing
Term
Ways of charging objects are...
Definition

i) conduction- touching (transfers electrons)

ii) induction - no touching

Supporting users have an ad free experience!