Sample
Summaries after sample
, Electrical systems and controls
U1: Magnetism
• :
Module focus: Electrical systems &
control. • Magnetite is a natural rock that attracts iron.
• Previously learnt: Mechanical systems • Named after Magnesia in Asia.
(levers & hydraulics). • Ancient Chinese used magnetite over 4 000
• Recycling industry: Pulleys, cranes lift years ago to find direction.
scrap metal. • Floating magnetite pointed north to help sailors
• Electromagnets: and travellers with navigation.
• Made using electric current through coils. U1: • Magnetism causes attraction and repulsion.
• Can switch on/off. • A magnet produces a magnetic field where
Magnetism
Sample
• Used to lift iron scrap. forces can be felt.
• Environment: Recycling helps conserve • Permanent magnets are always magnetic.
nature. • Temporary magnets (electromagnets) work
only with electric current.
• Examples of permanent magnets: horseshoe
Magnets have a magnetic field and poles magnets, bar magnets.
•
•
•
•
Summaries after sample
Magnetic field: area around magnet where force is felt.
Magnetic field lines run from north pole to south pole.
Magnetic force (pulling force) acts all around the magnet.
Opposite poles attract.
•
•
Magnetite is a natural magnet.
Humans make artificial magnets for practical
uses.
Magnetic and non-magnetic substances
Propper care of magnets
• Magnet – does not attract all substances.
• Avoid dropping or hitting magnets. • Magnetic substances – substances attracted
• Do not heat them or place near flames. by a magnet.
• Store with opposite poles facing. • Non-magnetic substances – substances not
• Horseshoe magnets need a keeper plate for attracted by a magnet.
storage.
GR7 TECH T3-M5 Mind Map Spot On Copyright © www.summariessa.co.za (DO NOT COPY)
, Sample
Summaries after sample
Summaries after sample
, Electrical systems and controls
U1: Magnetism
• :
Module focus: Electrical systems &
control. • Magnetite is a natural rock that attracts iron.
• Previously learnt: Mechanical systems • Named after Magnesia in Asia.
(levers & hydraulics). • Ancient Chinese used magnetite over 4 000
• Recycling industry: Pulleys, cranes lift years ago to find direction.
scrap metal. • Floating magnetite pointed north to help sailors
• Electromagnets: and travellers with navigation.
• Made using electric current through coils. U1: • Magnetism causes attraction and repulsion.
• Can switch on/off. • A magnet produces a magnetic field where
Magnetism
Sample
• Used to lift iron scrap. forces can be felt.
• Environment: Recycling helps conserve • Permanent magnets are always magnetic.
nature. • Temporary magnets (electromagnets) work
only with electric current.
• Examples of permanent magnets: horseshoe
Magnets have a magnetic field and poles magnets, bar magnets.
•
•
•
•
Summaries after sample
Magnetic field: area around magnet where force is felt.
Magnetic field lines run from north pole to south pole.
Magnetic force (pulling force) acts all around the magnet.
Opposite poles attract.
•
•
Magnetite is a natural magnet.
Humans make artificial magnets for practical
uses.
Magnetic and non-magnetic substances
Propper care of magnets
• Magnet – does not attract all substances.
• Avoid dropping or hitting magnets. • Magnetic substances – substances attracted
• Do not heat them or place near flames. by a magnet.
• Store with opposite poles facing. • Non-magnetic substances – substances not
• Horseshoe magnets need a keeper plate for attracted by a magnet.
storage.
GR7 TECH T3-M5 Mind Map Spot On Copyright © www.summariessa.co.za (DO NOT COPY)
, Sample
Summaries after sample
