Circuit Introduction Section 1:

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Presentation transcript:

Circuit Introduction Section 1: Warm-up: Describe everything you know about circuits.

Activity: Parts of a Circuit: 1) 2) 3) Materials Needed: Battery, two light bulbs, Led and two wires Objective: Try to get one light bulb to light. Parts of a Circuit: 1) 2) 3)

Parts of an Electrical Circuit:

Two types of Circuits Series Circuit: Electrons flow on one path only. Parallel Circuit: Electrons can take two or more optional paths

Voltage, Current & Resistance Voltage (V) : Current (I) : Resistance (R): Power (P):

Types of Electric Current (demos: Christmas lights) Alternating Current (AC) Direct Current (DC) Definition: Comes From: Definition: Comes from:

Activity: Finding Resistance Voltage (V) Current (Amps) 1.5 3 4.5 6 Voltage Vs Current Materials: 3 D cell batteries Alligator wire Light bulb

Power Equation: Ohm’s Law: 1) Current in circuit: 2) Power consumed: The following battery has a voltage of 1.5 volts and is connected to a light bulb that has a resistance of 20 Ω. Find the following

More Sample Problems: Find the resistance in the light bulb. With this resistance, how much voltage would have to be applied to reach .1 amps. Find the power produced from the circuit.

Circuit Parts Resistors: Slow the flow of current Diodes: Only allow the current to flow in one direction. Light Emitting Diodes (LED): Only allow the flow of current in one direction and produce light.

Reading Resistors:

Resistor Practice Problems __ __ x 10 ___

Reading Resistors Mini Activity Objective: Write out the resistor color code on the picture and then record its resistance. (Do in notes) Calc:____________ Measured:________ Resistor 1: Resistor 2: Resistor 3: Resistor 4: Calc:____________ Measured:________ Calc:____________ Measured:________ Calc:____________ Measured:________

Schematic Diagram Symbols

Using the Multimeter Quiz 1) Find the voltage for: Battery:__________ Resistor:_________ 2) Find the current through the resistor:_________ 3) Find the resistances: Measured resistance:________ Calculated Resistance:_______

Class work and Homework Pg 615 (1-6) Pg 621 (1-5)