Unit 9 - Simple Circuits

Unit 9 - Open and Closed Circuits

By S Harris

I know...

• the difference between an open and closed circuit.​

​​Learning Target

I can...

• draw and explain the schematic diagram of a closed or open circuit.

​​Success Criteria

2 Types of Batteries:

1. Dry Cell - traditional batteries; uses a paste electrolyte with enough moisture to allow current to flow

2. Wet Cell​ - electric battery device consisting of 2 or more electrochemical cells that convert chemical energy into electrical energy using a liquid electrolyte

Batteries and Electrical Circuits

​

the electrolyte is not really dry; it is a paste

• these are your standard AA, C, and D type batteries

• the (+) terminal is made of carbon​

Dry Cell

the electrolyte is a liquid

• example: car battery

  • the electrolyte here is sulfuric acid​

Wet Cell

• a cathode (+)

• an anode (-)

• an electrolyte

The cathode (positive end) and anode (negative end) are hooked up to an electrical circuit

Batteries have 3 parts...

​

• an energy source

  • which provides the "push"; volts

• the load

  • which converts electrical energy to another form of energy

• the wires

  • which connect the source and load together

• the switch​

  • which opens and closes the circuit

Circuits have 4 parts...​

the circuit's pathway is broken

• meaning the switch is open or a part of the circuit is disconnected and electrons cannot flow to the load.

  • has "breaks" in the circuit​

​​Open Circuit (no light)​

the circuit path is complete, meaning that the switch is closed and electrons are allowed to flow

• each part of the circuit is connected​

​​Closed Circuit (light)​

​Lightbulb

Schematic Diagrams are pictures that we can use to show circuits in a simple way.

• they use symbols like the ones in the top right image to represent the parts of a circuit

Circuit Diagrams Practice

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Circuit Diagrams Practice.

• will the lightbulb turn on?​

​

Circuit Diagrams Practice.

• will the lightbulb turn on?​

​

Circuit Diagrams Practice.

• will light 2 turn on if light 1 is unscrewed?​

​

​1

​2