Electrical Circuits Targeted Skills for Circuits 1.Define: voltage, current, resistance, power, and Ohm's Law. 2. Qualitatively analyze series, parallel and combination circuit problems

Electrical Circuits Targeted Skills for Circuits 3. Draw schematic diagrams. 4. Construct a circuit and properly wire an ammeter and voltmeter. 5. Solve series, parallel and combination circuit problems.

Draw orientations that result in the bulb lighting. Draw the inner workings of a light bulb. Introduction Lab – Post Lab

Conductors and Insulators Definitions: Conducting Path Polarity

Definitions Conducting Path Polarity

Types of Connections: Series Connection Parallel Connection

Schematic Diagram Elements Wire Resistor Bulb

Schematic Diagram Elements Battery Switch

Power Polarity Definition Equations:

Bulb brightness - PreLab

Bulb brightness – Post Lab

Qualitative Circuit Analysis

Example #1 A 60 W light bulb is accidentally left on in the attic when you put Christmas ornaments away. If the bulb is left on until the following Christmas and doesn’t burn out, how much energy does the bulb use in the intervening year? G: P=60 W, T= 1 yr, $= $0.08 per kW hr U: Cost per year = _____ E: P = W/T S: See Overhead If the electric company charges $0.08 per kW hr, how much did you forgetfulness cost your parents?

Meters Definitions Current Conventional Electron Flow

Meters Ammeter Voltmeter

Meters Series Connection Parallel Connection

Schematic Diagram Elements Ammeter Voltmeter

Bulbs Reading Lab - PreLab Definitions Power

Bulbs Reading Lab - PostLab

Kirchoff’s Laws Loop Law

Kirchoff’s Laws Junction Law

Ohm’s Law PreLab Purpose Hypothesis Sketch

Ohm’s Law PreLab You will have the entire class period to collect and begin your data analysis. The completed lab report is due the next class period. You will be given 20 minutes to write your in-class conclusion at the first of the next class period. You may use your lab report to assist you in your writing as well as the teacher provided copy of the conclusion format sheet (example removed). The lab report and conclusion will be collect after the 20 minute writing period.

Series and Parallel Lab - PreLab

Ohm’s Law Post Lab

Series and Parallel Lab - PostLab

Equivalent Resistance Series Circuit

Equivalent Resistance Parallel Circuit

Equivalent Resistance Compound Circuit

Example #2 A battery charger is connected to a dead battery and delivers a current of 8.0 A for 3.0 hrs, keeping the voltage across the terminals at 12 in the process. G: P=60 W, T= 1 yr, $= $0.08 per kW hr U: Cost per year = _____ E: V = IR, P = W/T S: See Overhead How much energy is delivered to the battery? What is the internal resistance of the battery?

Example #3 A circuit is composed of a 24 V battery and four resistors, whose resistances are 110 , 180 , 220 , and 240 . G: V = 24 V U: I series = _____, I PARALLEL = _____ E: V = IR, R series = R 1 + R 2 …, R parallel = 1/ R 1 + 1/ R 2 + … S: See Overhead, S: See Overhead Find the total current supplied by the battery if the resistors are connected in parallel. Find the total current supplied by the battery if the resistors are connected in series.

Example #4 Complete the VIRP chart for a 2  and a 6  resistor wired in series with a 12 V battery. VoltageCurrentResistancePower 1 2 Total

Example #4 For the 2  and a 6  resistor wired in series with a 12 V battery. Draw the schematic diagram

Example #5 Complete the VIRP chart for a 2  and a 6  resistor wired in parallel with a 12 V battery. VoltageCurrentResistancePower 1 2 Total VoltageCurrentResistancePower 1 2 Total

Example #5 For the 2  and a 6  resistor wired in series with a 12 V battery. Draw the schematic diagram

Example #6 Complete the VIRP chart for for the circuit shown to the right. Let V = 16 V, R 1 = 4 , R 2 = R 3 = 8  VoltageCurrentResistancePower 1 2 Total