# P1 Unit 5: Generation and Transmission of Electricity

• Created by: nicola
• Created on: 18-04-15 10:42
What is a current?
The rate of flow of charge (how many coulombs pass a point every second). Is measured in A for Amps.
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What is a voltage (potenial different)?
The electrical pressure that make the current flow (the amount of energy given to every Coulomb). Is mesured in V for volts.
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What is meant by the term power?
How much energy is transfered every second and is measured in W for watts or J/s for Joules per second.
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What are the different type of power station? 1/2
Renewable: +Energy source will never run out. +Do little damage to the environment. -Don't provide much energy - unreliable. E.g. Wind, wave, solar panels and hydroelectectric.
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What are the different type of power station? 2/2
Non-renewable: +Provide alot of energy/reliably -Do a lot of damage to the environment -Will eventually run out. E.g. Gas, coal, oil, nuclear.
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How do you increase the inducing current?
Stronger magnet, more coils and faster relative motion of coils and magnet all increase the induced current.
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Hhow do you reverse the current?
To change the direction of the current move the magnet or coil in the opposite direction, insert the other end of the magnet into the coil or insert the magnet into the end of the coil.
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What is a generators?
Gentertors/Power stations produce A.C. Alternating Current by spinning a magnet in a coil of wire or by spinning a coil of wire inside a magnetic field.
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What is Direcct Current D.C?
The current only flows in one direction either always positive or always negative.
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What is Alterating Current A.C?
The current continuously changes direction from positive to negative.
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What are Transformers?
Transformers only work with Alternating Current. Step up transformer step up the voltage thus tepping down the down current. Step down transformers step down the voltage.
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What does the National Grid consit of?
The National grid consits of pylons, high voltages cables and step up and step down transformers.
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How does the National Grid work? 1/2
Power stations produce electricity at the most efficient voltage, step up transformers are then used to increase the voltage and decrease the current so very little energy is wasted as heat in the high voltage cables.
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How does the National Grid work? 2/2
Step down transformers are then used to reduce the voltage so it is safe to use in our homes. High voltage cables are dangerous because the elctricity can jump through the air and kill so they are carriedhigh above the groud well out of reach.
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Why do we use low energy appliaces?
Using low energy applaiances use less electricity so save money, natural resources and causes less damages to the enviroment as the power station burns less fuel.
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## Other cards in this set

### Card 2

#### Front

What is a voltage (potenial different)?

#### Back

The electrical pressure that make the current flow (the amount of energy given to every Coulomb). Is mesured in V for volts.

### Card 3

#### Front

What is meant by the term power?

### Card 4

#### Front

What are the different type of power station? 1/2

### Card 5

#### Front

What are the different type of power station? 2/2