### current:

Direct current
* comes primarily from batteries.
* has two poles, one positive, one negative, flowing from negative to positive.
* is created by devices such as batteries and solar panels
  - electricity
* is produced by batteries
  - electrochemical and photovoltaic cells and batteries
  - supplied from batteries
  - used to charge batteries and as power supply for electronic systems
  - when the current can go both ways though a conductor
  - where at all times the voltage polarity remains constant
+ Inverter: Electricity :: Machines
  * Direct current is created by devices such as batteries and solar panels. When connected, an inverter allows these devices to provide electric power for small household devices. The inverter does this through a complex process of electrical adjustment. From this process, AC electric power is produced. This form of electricity can be used to power an electric light, a microwave oven, or some other electric machine.

### current:

Eddy
* Eddies also allow time course studies in a stable water mass
  - play a role in human pursuits
* Eddies are common in the sea valley to the west of Kodiak Island
  - nuts
  - programmers
  - relatively stationary bodies of air or water, holding everything in it for awhile
  - the main reason that Denver has so much air pollution
  - commonly develop inside a major current that flows along the coast, such as the Gulf Stream
  - develop on both sides of the jet during ebb flow
  - often provide a safe place to get out of the current
  - play an important role in transporting heat, salt and nutrients around the globe
* Many eddies dissipate in the coastal waters of Nicaragua a half-year after they appear.
* Some eddies form when meanders in the Gulf Stream are pinched off and wander into the Sargasso Sea.
* is current

Eddy current
* are closed loops of current that flow in planes perpendicular to the magnetic field
  - electric currents that occur in conductors exposed to changing magnetic fields
* consume a considerable amount of energy and often cause a harmful rise in temperature.
* is used extensively in checking the integrity of airplanes.
* produce heat which loss of power and lowers the efficiency of an inductor.

### current:

Electrical current
* Some electrical current is generated by contraction.
* can cause cardiac arrhythmias including cardiac arrest
  - flow forever in a loop made of a superconducting wire
* can travel through water, and electrocution major killer in floods
  - so electrocution major killer in flooded areas
* cause electromagnetic fields
* creates fields
* flowing in transmitter coils in the bird induces current in the ground.
* is analogous to water flow rate
  - conducted better in some gemstones than others
  - is measured as ampacity
  - like the amount or volume of water flowing through the hose
  - measured in amperes
  - passed through the filament loop
  - proportional to the power that the solar cell delivers
  - really the movement of electrons through a conductor
  - run through the tungsten filament, causing it to glow and emit electrons
  - similar to the rate of water flowing through a hose
* is the electron charge in motion
  - flow of electric charge
  - movement of electrons in a conductor
  - rate of flow of electric charge
  - used to burn the blood vessels
  - what makes our hearts beat
* passes through materials.
* produces fields
* travelling through water can lead to electrocution.
* wants to flow from one side of the battery to the other.

High current
* allow too much power, or electrical energy to be wasted in wires in the form of heat.
* is never dangerous as long as it remains contained inside a wire.

Higher current
* can result in electrical burns where tissue is destroyed.
* cause the filament of the bulb to get hotter and to emit more light.

Larger current
* can cause tissue damage and burns.
* produce larger forces.