Electricity

Unit J

Do Now:

• https://www.youtube.com/watch?v=igK-DRB5faU

Measuring Electricity

• Ammeter – measures electricity – Measures current in Amps– Current – moving electricity

Components

• Parts of a circuit:

Questions?

• Does the current change be having an ammeter in the circuit?

• Does the current change by having an extra bulb?

Do Now:

• Current is the amount of electricity flowing through a circuit.

• What happens if the current is to high?

What Happens When you heat Steel Wool?

• https://www.youtube.com/watch?v=v7M18IObc6c

Resistor

• Resistor – makes the current smaller using resistance

• Why is reducing current important?– Metal gets hot as current runs through it

Fuses

• Fuse – a piece of wire designed to melt if the current

• Typically located in the plug• Every plug has a different

fuse, depending on how much current the appliance can take

Plugs

Do Now:

• Complete the worksheet and place it into your book.

• First person to finish and glue in gets 2 house points

Series and Parallel Circuits

• Simple Circuit – Only cell connected to bulb

• Series Circuit – Everything connected in a loop

• Parallel Circuit – “Branches” to connect everything

Current Flow

Benefits of a Parallel Circuit

• Current flows through the branches, even if one branch is broken

Current in the Circuit

• Parallel Circuits – divided amps• Series Circuits – equal amps

• https://phet.colorado.edu/en/simulation/circuit-construction-kit-dc

Do Now:

• Open your books to page 143, answer questions 3 and 4 after reviewing the circuit diagrams

Electricity Inside You

• Impulses – electrically signals sent through your body to your brain

• Nerves – impulse travel along your nerves

Pacemakers

• Impulses keep your beating, when they cannot reach your heart properly you may have to get a pacemaker to keep your heart beating properly

When your heart stops beating…

• Doctors can use a defibrillator to “restart” your heart– It sends an electrical current through your body

Electric Shock

• Electric Shock – when electricity is sent through the body by an outside source

Natural Resistor

• Your body acts as a natural resistor• When wet, the resistance is lowered– You will be more affected by an electric current

Activity:

• Discuss with a partner:• How can electrical shocks be useful?