Electricity And Magnestism Flashcards
What’s a conductor
Allows charge to flow through it
What’s an insulator
Doesn’t allow charge to flow through it
What does a conducted have
Free electrons (charges) that drift along the wire from atom to atom.
Electrons are always
Negative
How do we measure current
Using an ammeter
What is current measured in
Amps (A)
What’s a series circuit
It has the same current at all points
Why is there less flow of charge when more components are added
There is more resistance to the flow of charge meaning that the current is reduced decreasing the brightness of the bulbs
What’s a parallel circuit
Where the current has a choice of routes
|l
Cell
|l—|l—
Battery
-
Connecting Wire
Circle with m in it
Motor
Rectangle with arrow pointing through it
Variable resistor
-•/•-
Ope switch
Circle with x in it
Bulb
Circle with v in it
Voltmeter
Circle with a in it
Ammeter
-•-•-
Closed switch
What happens to the electrons if there is a high resistance
It means they can’t flow as easily
What does an open switch do
It stops the flow of charge
A voltage of one volt means …
Each unit of charge is given 1j of energy
What happens if there are more cells in series
There is a bigger voltage because there is a bigger difference in energy across the battery
Voltage is shared in series
Voltage is equal to the cell in parallel
How do you work out the voltage of something
V= resistance (ohms) x current (A)
Lemons oranges ect because they are acidic
What types of fruit are the best
What is static electricity
When charge builds up on an object and doesn’t move. Rubbing insulators together will transfer electrons from one to another. The type if materiel of the cloth and the rod determines which gains the electrons
What happens to the substance that gains electrons
They become negatively charged. A substance that loses electrons becomes positively charged
What type of materials conduct heat
Metals
