P5 Flashcards
SCI unit for Power. [1]
W or Watt
SCI unit for energy. [1]
J or Joules
SCI unit for Current. [1]
A or Ampere
SCI Unit for Charge. [1]
C or Coulums
SCI Unit for Potential Difference. [1]
V or Volt
SCI Unit for Electro Motive Force. [1]
V or Volt
What are conductors, give some examples. [2]
Materials that Allow electric current to go through because they have free electron/delocalised electrons.
Examples -
Metal : Copper, Iron
Non-Metal : Graphite, graphine
What are Insulators, give some examples. [2]
They do not allow electric current o thorugh because they do not have delocalised elctrons and electrons are held tight to the atom.
Examples -
Plastic, wood and glass
What are Semi-Conductors, give some examples. [2]
Poor conductor when it is cold, however when it is hot it allows electric current to fo through
silicon, Germanium
When rubbing a perspex rod onto a cloth, what is the charge of the fabric and the rod; and in which direction do the electrons move? [3]
Move of charge : Rod to cloth
Charge of cloth : -
Charge of rod : +
When rubbing a Polythene rod onto a cloth, what is the charge of the cloth and the rod; and in which direction do the electrons move? [3]
Move of charge : cloth to Rod
Charge of cloth : +
Charge of rod : -
State what is meant by the direction of an electric field. [1]
The direction of the force on a positive charge.
What is an Electrical Field? [1]
A region around a charged particle or object within which a force would be exerted on other charged particles or objects.
Describe how to plot an electrical field with a compass and a magnet.[4]
- Place the compass at the end of the magnet
- Mark where the arrow points
- Move the magnet to this point
- Mark where the arrow points again
- Continue doing this until the path leaves the paper or reaches the other end of the magnet
- Repeat(for another starting point at the end of the magnet)
- Show the direction
What direction do electrons travel? [1]
Positive to Negative : + –> -
