Physics electric current formulas
factors of resistace of a wire
1. thickness 2. length 3. temperature 4. material
1 amph of flow
6.25 * 10^18
how much natural gas does big alice's boiler consume
9 meters
what do the fan blades of a turbine turn?
a generator
ohms law
current = voltage / resistance
what do generators produce
electrons
parallel circuits
- resistors are called "loads" - *if you increase the resistance you increase the current* - the voltage difference across the battery is the same across the resistors
100 pounds of coal is equal to
1 tank of gas
how much energy does the sun send down to the earth
100,000 TW
how much energy does our society use in a year
17 TW
how much electricity does big alice produce?
22%, 2300 mega watts
on pound of uranium has more power than _____ coal
3 million pounds
fossil fuels supply ______ of our energy
80%
what is the name of the network of cables, transformers and power stations that power new york?
The Grid
electric potential (voltage)
a battery can maintain a steady flow of charge - the work is done by pulling electrons away from protons - electrons are moved because of electromagnetic induction - the difference in voltage between two points - measured in two places (change)
what simple machine supplys electricity
a turbine
What is the hungriest appliance of all
air conditioner
current units
ampheres , coulombs / time
nuclear power biggest problem is
an image problem
what is the best type of coal
anthracite
what is the name of the ravenwood generating station?
big alice
how do you release the energy in chemical bonds
burning
the downside to using fossil fuels is what?
carbon dioxide
high temp supercontors
ceramic materials that carry lots of current with low voltage
what device reveals the uranium atoms?
cloud chamber
what is solar energy's biggest challenge?
cost
power
current (I)^2 * resistance
voltage
current * resistance
what bonds atoms together
electrons
alternating current
electrons move in more than one direction and they alternate between fixed positions accomplished by alternating the polarity of these currents
current def.
flow of charged particles measured in Amperes (Coulombs / seconds)
direct current
flows in one direction flows from negitive to positive
what reaction in the sun forces hydrogen atoms together
fusion
charge flows from
high to low
why were pre-urban lives bad?
human power
a long chain of carbon atoms bound to other elements
hydrocarbons
where are the majority of our important recourses forged?
inside the planet
when coal is burned it produces what?
light and heat
when did the increase of carbon in our atmosphere begin>
mid 1700's
dimesions of a wire (resistance)
more thickness = less resistance longer wire = more resistance
cheapest and cleanest fossil fuels
natural gas
what particle is smashed into an unstable uranium atoms to generate energy in a nuclear power plant
neutron
what could be wrapped around the world 4 times
new yorks underground cables
what source of energy does not contribute to carbon emmisions
nuclear energy
what powers planes, cars and trains
oil
the direction of current is
opposite the flow of electrons
carbon can also be used to make what?
plastic
long chains of carbon atoms
polymers
what substance allows electrons to move when the sun shines on it
semiconductos
what substance in sand changed the world
silicon
what carries electrons in a photovolatic cell
silicon atoms
what turns the fan blades of a tubine
steam
what brought the uranium atoms to the earths surface?
super volcano
resistance
that o looking symbol , voltage / current
what is Hanmin Liu making
the worlds largest rechargeable battery
what "small" element is in today's batterys
tithium
resistance
voltage / current
voltage units
volts , joules / coulombs
why were plastics revolutionary
we could create things without using products from nature
natural gas puts _____ less carbon dioxide than coal
50%
anthracite coal is
90% carbon
power
current * voltage
super conductors
materials that have zero resistance no generation of heat
power
voltage^2 / resistance
series circuits
- increase resistance, decrease current - current is the same throughout