Electricty And Magnetism Flashcards
Describe where charges come from and why static occurs?
Charges come from atoms containing protons and electrons. Static occurs when protons and electrons rub against eachother
What is potential difference
Potential difference is a cell providing a push to make charges move
How is P.d measured
It is measured with a voltmetre. (V)
What is the formula for calculating resistence
R=V/I
V=IxR
What is an insulator
a substance which does not readily allow the passage of heat
What is a conductor
A material or an object that conducts heat, electricity, light, or sound.
Uses of electromagnets
Junkyards
Magnet and non magnet separation
Electrical bells and buzzers
Tapes and VCR’s
How electromagnets work
An electrical magnets works by a wire coiled around it and current flows through the wire o create a magnetic field. (A Magnet)
How to make a electromagnet stronger
Increase the amount of coils
Add an iron nail
Increase the current
What is current
Current is an electrical charge
How is current measured
It is measured using an ampmetre
A
What is resistance measured in
Resistance is measured in ohms
What is resistance
Difficulty of the electric current passing through the conductor.
