Write this in your notebook. 5.8 Circuits: Write this in your notebook. A circuit is made up of a power supply, connecting wires & various components that allow current to leave a power source, travel through the components & return back to the power source.

Common Electric Symbols Write in your notebook. Common Electric Symbols Battery/Power Source Bulb

Common symbols (cont’d) Write this in your notebook. Common symbols (cont’d) Switch Push-button Switch Resistor Voltmeter Ammeter V A

What are we doing? Send 1 person to pick up: 1 battery 1 light bulb 2 wires Sandpaper Make the light bulb light up! Once you do … go get a switch and more wires and add it to your circuit. Draw a circuit diagram. HAND IT IN. Return the materials.

Write this in your notebook. Circuits Write this in your notebook. Power Supply Switch A v Light bulb Ammeter Resistor Voltmeter

Types of Circuits: There are 2 types of circuits: SERIES PARALLEL Trick to help identify type of circuit: Series: Pen follows wire Parallel: Pen can go in more than one direction There are 2 types of circuits: 1. Series Circuit 2. Parallel Circuit Write this in your notebook. SERIES PARALLEL

Write this in your notebook. Series Circuits: Components are connected end to end Current only follows one path If one part of the circuit is broken, the entire circuit will stop functioning Eg: Some Christmas tree lights Write this in your notebook.

Write this in your notebook. Parallel Circuits: Write this in your notebook. Circuit that contains at least one branch Current can follow at least 2 different paths If part of the circuit is defective another part may still be able to operate. Eg: headlights on a car

Example Series or Parallel? 2. 1. PARALLEL SERIES A 3. 4. SERIES

Volts, Ohm’s and Amps in a Series Circuit In a series circuit, the Amps remain constant throughout the whole circuit Amps = 2A Write this in your notebook. Amps = 2A Amps = 2A

VT= V1 + V2 + V3 + … However, in a series circuit at each resistor the volts change. When you add up all the voltage at each resistor, you end up getting the total volts going through the circuit. Volts1 = 2V Volts total = 7V Amps = 2A Volts2 = 3V Amps = 2A Amps = 2A Volts3 = 2V

In a parallel series, each line of wire has a different amount of amps In a parallel series, each line of wire has a different amount of amps. When added the amps together, you get the total amount of amps in the entire circuit. Amps3 = 1A Amps2 = .5A Amps1 = .5A

However, in a parallel circuit if you have a total of 3 volts in the circuit, each resistor will only have 3 volts Volts3 = 3V Amps3 = 1A Volts2 = 3V Amps2 = .5A Amps1 = .5A Volts1 = 3V Volts Total = 3V

5.9 Kirchhoff’s Laws about Volts, Ohms & Amps. For circuits in: Series: Amps stay the same everywhere in the circuit. Volts are split over each resistor but add up to Vtotal. Parallel: Amps split at each resistor but add up to Atotal. Volts stay the same everywhere in the circuit.