Electric power is electric particles moving through metal, semiconductor or graphite and special fluids (electrolysis). Some kind of gas are able to conduct inspecial cases with much power. Electric power in the air (luft), metal (metal) and fluid (væske) What is electric power?

There is tree importent kind of electric particles: electrons, who are streaming through solid substances: Metal, semiconductor or graphite +ion and -ion, which, streams in fluids and the air (in the air it is possible as well with electrons) Elevtricity in fluide

Electric power are not moving just as well through all substances. It work best in, what we call conduktors (as metal and a saline solution). Metalwires Some are much worse. It is semiconductores (elements, used to make diodes, transistor etc. For electricician devices). Some examples: Halvledere At last some substances are not able to conduct electricity. We call these for isolatores (like glas and plastic) Isolator Taken out of radios and thinks like that.

Voltage or potential difference or… what makes the particles moves Something has to push the electric particles through the wires, air or fluids – a kind of compressor. A battery or generator (dynamo). The pumping press in a battery is measured in Volt (V) with a voltmeter. This pressure we call voltage or potential difference.

Current intensity How many particles per secund? If the pressure is going up (more voltage) the particles will move faster, and more particles will pass through the wire. How many electric particles streams through the wire measures in ampere (A) with an ammeter.

Resistance It can be difficult for the electric particles to move. In some wires/material the particles can’t move wery well. They makes resistance against the power. There has to be more pressure (more voltages) to press enough particles through or more particles (ampere). Resistance measures in ohm (Ω). Ohmmeter

Som regel bruger man et multimeter, både når man skal måle spænding, strøm og modstand. Ved at dreje på en knap kan man bestemme, hvad man vil måle. Så kan man klare sig med ét instrument til det hele. De tre grundlæggende enheder i forbindelse med elektricitet: Spænding kaldes U og måles i volt (V).Spænding kaldes U og måles i volt (V). Strøm kaldes I og måles i ampere (A).Strøm kaldes I og måles i ampere (A). Modstand kaldes R og måles i ohm ()Modstand kaldes R og måles i ohm () Mellem de tre begreber er der en nøje sammenhæng: Ohms lov Som regel bruger man et multimeter, både når man skal måle spænding, strøm og modstand. Ved at dreje på en knap kan man bestemme, hvad man vil måle. Så kan man klare sig med ét instrument til det hele. De tre grundlæggende enheder i forbindelse med elektricitet: Spænding kaldes U og måles i volt (V).Spænding kaldes U og måles i volt (V). Strøm kaldes I og måles i ampere (A).Strøm kaldes I og måles i ampere (A). Modstand kaldes R og måles i ohm ()Modstand kaldes R og måles i ohm () Mellem de tre begreber er der en nøje sammenhæng: Ohms lov The tree basic units about electricity: For these tree units you can use ”Ohm’s law” U = R * I Voltage (U) measured in volt (V). Current intensity (I) measures in ampere (A). Resistance (R) measures in ohm (  )

Effekt (Watt) An electrician device like a bulb you can see that it is maybee 60 W or 600 W. We call it the effect of the device. This information tells you how much electrician energy the device use. The unit is watt (W) An electrician device like a bulb you can see that it is maybee 60 W or 600 W. We call it the effect of the device. This information tells you how much electrician energy the device use. The unit is watt (W) A 600 W device uses 10 times as much electrician power as a 60 W device at the same time.

Ohm’s law U is volt. Potential difference abbreviates V. I is Ampere. It is the number of electrician particles a circuit uses abbreviates A. R is Ohm. It is the ressistance in the circuit abbreviates Ω. P is Watt. Watt is the electrician power, abbreviates W.

Produktion of electric power

Energy flow From where do we get energy? From where do we get energy?

Denish energy flow year 2003

TWh Nuclear powerCoal Natural gasOil Renewable energies El production 1999 EU ,532.3 Frankrig Stor Britanien Italien Spanien Danmark Energy sources 1999

Powerstation

Oil refinery

Refining oil

Temperatures for evaporation

Refining oil