P3 Flashcards
Draw the circuit symbols for a cell, battery, LDR, Ammeter, LED, switch and diode.
Textbook page 34.
Electric force acts between bodies that have __________.
Net charge.
Electric force can be ________ or ________.
Attractive or repulsive.
Define static electricity.
Elwctrical effects produced by friction - rubbing two insulators together.
Explain how static electricity works.
When two insulators are rubbed together, friction transfers the electrons from one object to another. This leaves behind a positively-charged object as well as a negatively-charged object, with an excess of electrons.
What is an electric field?
The space around a charged object.
What are the risks of an object having a strong electric field?
It can cause particles in the air to form ions as they are separated from their electrons. The electric field can accelerate the movement between these charged particles, and when there is a lot of movement, the air sparks.
Why metals good conductors of electricity?
(you know the answer form chemistry but a simplified version is this:) metals gain and lose electrons very easily.
Why does your hair stand on end when you touch a Vaan de Graff generator?
When the Vaan de Graff geneeator is switched on, it fills the student’s body with electrical charge. This charge will try to leave the body through the lightest part - the hair. This will fill each hair on your head with the exact same charge, causing them to repel and thus stand on end.
What do Ammeters measure?
Current (Amps)
What is current?
The rate of flow of charge.
Give the formula for current.
current = charge ÷ time
Give the formula for charge.
charge flow = current x time
What are the two types of electric force?
Attraction and repulsion.
Explain in terms of electric fields why like charges repel and opposite charges attract.
The electric fields of like charges straighten in opposite directions as they are moved closer together, causing them to repel.
The electric fields of opposite charges meet and pull towards each other when moved closer together, causing them to attract.
Draw diagram.
