This document discusses electrical and mechanical systems. It explains magnetism and how electromagnets work by attracting metals when electric current is present. It describes how to make an electromagnet and the benefits of recycling scrap metal for sustainability and money. The document also discusses simple electrical circuits including components like conductors and insulators. Furthermore, it explains cranks and pulleys as mechanical systems that can convert one type of force into another to provide mechanical advantage.

1. Educator: Mondlane.J
Electrical and mechanical system

2. Electrical and mechanical
system
Electrical and
mechanical system
Magnetism
Magnet and non-
magnetic metals
Mechanical system
and control
Cranks and pulleys
Revision structures
Electromagnets
Make an electromagnet
Recycling scrap metal
•Sustainability
•Money from waste
Drawing system and
circuit diagram
•Systems diagrams
•Circuit diagram
Simple electrical circuts
•Investigate electrical
circuts

3. Magnetism
 Magnetism is force
 A field- is place where a force works.
 Magnetism is a force that pushes or pulls.
 Magnetism force works because of the movement of electrons in
atoms.
 Permanent magnets works all the time.
 Electromagnets attack metals only when an electric current is
switched on.
 The magnet field starts at the north pole and ends the south
pole.
 Non- metals do not stick to magnets.
 Electromagnets are made of as oft iron core wrapped in wire
carrying electric current

4. Recycling scrap metals
 Reduce : is to make something smaller less
 Reuse is to something again to do the same thing or
something different.
 Recycle is to do something to materials so they can
be used again.
 Repurposed is to use a product or material for anew
reason
 Sustainability is using natural products and energy
in a way that does not harm the environment.

5. Simple electric circuits
 A moving electrical charge is called a current or an electrical
impulse.
 Materials that allow electricity to pass through are called
conductor.
 Materials that electricity cannot pass through are called
insulator.
 System diagrams help us to understand how circuit work.
 Component symbol are used when drawing circuit diagrams.
 Current movement of charge is an electrical conductor.

6. Cranks and pulleys
 Mechanisms can turn one kind of force into another
kind and give mechanical advantage .
 Crank is a right angled part of an axle or shaft that
converts rotary motion into other types of motion.
 Pulley are free-turning wheels with a groove that are
used to help lift weights.
 Some parts of structures resist pushing forces
(compression)
 Some parts of structures resist pulling forces (tension)

7. Cranks and pulleys
 Mechanisms can turn one kind of force into another
kind and give mechanical advantage .
 Crank is a right angled part of an axle or shaft that
converts rotary motion into other types of motion.
 Pulley are free-turning wheels with a groove that are
used to help lift weights.
 Some parts of structures resist pushing forces
(compression)
 Some parts of structures resist pulling forces (tension)