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Starter
Benjamin Franklin
Thomas Edison
• Have you heard of these people?• Why are they significant?
• Benjamin Franklin– Proved that lightning was electricity by flying a kite
in a lightning storm– Helped people understand the principles of
electricity
• Thomas Edison– Invented the electrical light bulb
Lesson Outcomes
• Level 3 – Name a material that conducts electricity and a material that insulates electricity
• Level 4 – be able to build a circuit using the circuit boards
• Know the difference between a complete and an incomplete circuit
• Level 5 – be able to name the components in the circuits and draw symbols for them
What is electricity?
• Electricity is a form of energy• It flows through certain materials, called
conductors• Materials which electricity can’t flow through
are called insulators
Insulator or conductor?• Decide which of these materials can conduct
electricity:
metalPlastic
Wood
Water People
What is an Electrical Circuit?
• A circuit is an electrical device that provides a path for electricity to flow
Complete or Incomplete?
• A complete circuit is where all the components of a circuit are joined up and there are no gaps
• The pathway for electricity is complete
Complete or Incomplete?
• An incomplete circuit is where the pathway for electricity is broken
• The electricity cannot flow
Component Symbols – a cell
• A cell is what gives the circuit power
• The long line is the positive end
• The short line is the negative end
Battery
• A battery is made up of 2 or more cells
• It gives the circuit power
• It is important that each cell faces the right way
Switch
• A switch can be open (as shown) or closed
• When the switch is open, the circuit is incomplete – no electricity can flow
• What happens when the switch is closed?
Bulb / Lamp
• The lamp lights up when electricity flows through it
• What would happen to a lamp if there was an open switch in the circuit?
Voltmeter
• The voltmeter measures the voltage of the circuit
• This is the push of electricity around the circuit
Ammeter
• The ammeter measures the current in the circuit
• This is the flow of electricity around the circuit
Quiz1. Name 1 material that conducts electricity2. Name 1 material that is an electrical insulator3. What does this symbol stand for?
4. What does this symbol stand for?
Circuit Diagrams
• An easy way to draw a circuit is with a circuit diagram
• Draw a complete circuit
• Draw an incomplete circuit
Circuit Diagrams
RULES:1. Each component has its own symbol
2. Wires connect the components
3. Wires must be drawn with straight lines with a ruler
4. The wires should never cross each other