What are atoms? Learning target: I will be able to describe the Bohr model of atoms.

The universe's building blocks. All matter is made of atoms. The universe's building blocks.

Nucleus Shells

What are atoms made from? Learning target: I will be able to explain correctly the different parts of an atom.

+ Protons * Positive charge Mass of 1 amu. * Found in the nucleus. Atomic number Protons

Found in the outer shells. * Negative charge * No mass. - Found in the outer shells. Electrons

Protons + Neutrons = atomic mass * No charge. * Found in the nucleus. * Mass 1 amu. Neutrons Protons + Neutrons = atomic mass

Are all atoms the same?

No!

What do atoms look like?

Atom Activity Is that always true of neutrons? ISOTOPE??? What did you notice about the number of protons and electrons? Is that always true of neutrons? ISOTOPE???

How do we use a periodic table? Learning target: I will be able to use the periodic table to get information about elements.

saying: Opposites attract? Have you ever heard the saying: Opposites attract? Where does it come from?

What is a magnet? Learning target: I can explain how magnets work.

A magnet is made when All Atoms are made to face the same Direction.

Opposites attract like repel. N S Opposites attract like repel.

Electromagnetic field

More on magnets later. But first.... What is electricity?

Which sub atomic particle do you think electricity is linked to?

Ok you guess it... Electrons of course! e -

Atoms should equal. Same number or protons and electrons. + -

Sometimes they become Charged. + _ Or

That means they either gain or lose electrons. So they become positive or negative..

When an element becomes Charged it is called an Ion. + Na NaCl - Cl

How do they become charged? Learning target: I can explain how atoms become charged and how this can lead to electricity.

How do Atoms become charged? Activity 1 * Collect a balloon and a few pieces of tissue paper. Now blow the balloon up and rub it on your head or sweater fast for 1 minute. * Now bring the balloon close to the Tissue paper. What happens?

Again rub your balloon on your sweater as fast as you can for 1 min. Activity 2 Again rub your balloon on your sweater as fast as you can for 1 min. This time I would like you to place the balloon on the wall or the ceiling? What happens?

Friction The electrons are literally rubbed of the atom!

The charge is passed by physical contact. Conduction The charge is passed by physical contact.

Induction charging is a method used to charge an object without actually touching the object to any other charged object. Induction

Why electrons?

What do we call the movement of electrons?

This flow of electrons is called a current.

The movement of these electrons is electricity. - - e - - e e e http://10.181.3.241/?a=3202&ch=2

Sometimes electrons get pulled off an atom but, they do not move. - - - - - - This is Static electricity. Learning target: I will be able to explain static electricity and how it can impact living things.

Van De Graff generator Friction Induction Conduction

Friction Induction Conduction

Where do we experience static electricity in our lives?

The electons build up. - - - - The ground is positive + + + + + + + +

What could possibly happen?? It discharges of course.

Lightning dangers!

Back to current e e e e e The flow of electrons.

and is measured in Amps (A). When these electrons e move it is called current. and is measured in Amps (A).

electrons have is called How much energy these electrons have is called VOLTAGE. This is measured in VOLTS(v).

Circuits Learning target: I will be able to construct and compare series and parallel circuits.

What are circuits? Battery + Wires light bulb

Series : ONE AFTER ANOTHER There are two types. Series : ONE AFTER ANOTHER Parallel: CIRCUIT SPLITS. Learning target: I will be able to construct and compare series and parallel circuits.

Allows electricity to pass. Conductors Allows electricity to pass. Insulators Does not allow electricity to pass.

* The primary difference between DC and AC is the direction of current flow. * In a DC circuit, all electron current flow is in one direction. . *In an AC circuit, current flows CHANGES DIRECTION. An example of DC is the output of a battery. An example of AC is the power present in a home electrical system.

Why were some bulbs brighter? Learning target: I can explain the difference between conductors, insulators and semi conductors.

But why ???? Learning target: I will be able to explain the link between voltage, resistance and current.

Resistance The electrons have to fight to flow. It opposes movement of electrons.

Resistance is measured in ohms. Symbol Unit

Current is measured in Amps. The number of electrons is called current. Current is measured in Amps. I symbol A unit

Voltage is measure in volts. Voltage is the amount of energy The electrons have. Voltage is measure in volts. V unit &symbol

They are all showing what????

Resistance….. Ohm's Law The amount of fight a system puts up the few electrons can pass. That means Increase resistance reduce current!

v I R Resistance = Voltage ÷ Current Current = Voltage ÷ Resistance Voltage(V) = Current (I) x Resistance (R)

Electromagnets Learning target: I will be able to make an electromagnet and explain how it works.

Magnets we can switch on and off! We can make them more or less powerful! Activity

Uses of electromagnets? All motors require electromagnets.

MRI