All the Electricity stuff Flashcards
When you rub an acetate rod with a cloth where do the electrons transfer?
Onto the cloth.
When you rub a polythene rod with a cloth where do the electrons transfer?
Onto the rod.
What is earthing?
When electrons move from an object to the earth, this discharges the object.
How does lightning occur?
Static electricity builds up in clouds and causes a huge spark.
Why must aircraft be earthed before they are refuelled?
To stop the charged aircraft causing a spark that could potentially ignite the fuel causing a fire.
Whats the name of the metal wire used to earth aircraft?
Bonding wire.
Where can static electricity be used?
Insecticide sprayers and electrostatic paint sprayers.
What is a direct current?
A current thats electrons only flows in one direction.
What’s an alternating current?
A current thats electrons change direction many times a second.
What produces direct currents?
Cells/batteries.
What produces alternating currents?
Generators.
What is charge measured in?
Coulombs.
What do ammeters measure?
Current.
True or false:
Ammeters can be placed in series with other circuit components.
True.
Voltage is the same as _______ ___________.
Potential difference.
