Electricity and magnets

7.1 ELECTRICITY

All living things need energy What does energy mean?: ability to do work

  • Humans use energy to run

  • Plants need energy from the sun to live

  • Cars use energy from fuel

  • Light is made with energy

S.I unit - joule (J)

FORM OF ENERGY:

  1. Sound

  2. Kinetic

  3. Electric

  4. Gravity capacity

  5. Elastic capacity

  6. Light

  7. Nuclear

  8. Heat

  9. Chemistry

VARIOUS ENERGY SOURCES:

  1. Sun

  2. Geothermal

  3. Water

  4. Biomass

  5. Fossil Fuels

  6. Radioactive

  7. Wave

  8. Air

Electrostatic Charge

Electrostatic occurs due to our bodies transferring static to an object that has static. These static charges are known as electrostatic charge.

Whenever there’s friction between two objects, electrons only transfer from one object to the other, resulting protons don’t transfer.

  •  Positive charge
    more protons than electrons

  • Negative charge
    more electrons than protons

  • Neutral charge
    equal number of protons and electrons

ELECTROSCOPE

is a device used to detect presences of an electrical charge in the object

MAGNETISM

Magnets can occur naturally within lodestones. Therefore, man-made magnets are made using materials such as iron, nickel, steel and cobalt are used in our daily life.

MAGNET PROPETIES

  • Attract magnetic materials

  • Have a north and south pole

  • Can repel or attract other magnets depending on their orientation

  • Shows north-south direction

MAGNETIC FIELD

The area around the magnet exerts force from a magnet exists which is called a magnetic field

ELECTROMAGNET

is a type of magnet that has a temporary magnetic effect when an electric currents passes though