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Electric Circuit Fundamentals and Graphing Resistance Analysis

Explore key concepts of Ohm's Law, voltage, and resistance through circuit diagrams and graph plotting. Understand how to calculate resistance, interpret graphs, and analyze data related to electrical circuits. Perfect for SNC1D students.

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Electric Circuit Fundamentals and Graphing Resistance Analysis

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  1. Today’s Circuit • Draw the following circuit. 1)What is the potential difference across the power source? 2)What will happen if the switch is opened? 3)Which ammeter will have a greater current reading: the red or the green? SNC1D | Miss. Manaktola

  2. Ohm’s Law and Graphing SNC1D | Miss. Manaktola

  3. V R I calculating Resistance Use: R = V I to complete the table on page 2 of your handout. SNC1D | Miss. Manaktola

  4. Graphing Resistance What are the coordinates for the two points? A(0,0) B(20,6) What is the difference in the y coordinates between A and B? RISE  6 – 0 = 6 Volts What is the difference in the x coordinates between A and B? RUN  20 – 0 = 20 Amperes SLOPE = RISE = 20 RUN 6 SLOPE = 3.3 OHMS 2) Plot a graph of potential difference (y-axis) versus current (x-axis) B A SNC1D | Miss. Manaktola

  5. Recap • Plot the points, and draw a line of best fit. • Pick two points on the line • Figure out the coordinates of the two points. • Determine the RISE (Δy, or VERTICAL DISTANCE) between the two points. • Determine the RUN (Δx, or HORIZONTAL DISTANCE) between two points. • Calculate slope, with SLOPE = RISE RUN 7) CAUTION: Watch the units!!! SNC1D | Miss. Manaktola

  6. V R I Calculating Resistance 5) Make the calculations necessary to complete the table. What do you notice? 6) Graph it! SNC1D | Miss. Manaktola

  7. Graphing Resistance What's going on?

  8. Graphing Resistance 8)

  9. Calculate Slope! • Pick two points on the line • Figure out the coordinates of the two points. • Determine the RISE (Δy, or VERTICAL DISTANCE) between the two points. • Determine the RUN (Δx, or HORIZONTAL DISTANCE) between two points. • Calculate slope, with SLOPE = RISE RUN SNC1D | Miss. Manaktola

  10. B A Graphing Resistance What are the coordinates for the two points? A(0,0) B(0.04,6) What is the difference in the y coordinates between A and B? RISE  6 – 0 = 6 Volts What is the difference in the x coordinates between A and B? RUN  0.04 - 0 = 0.04 A SLOPE = RISE = 6 V RUN 0.04 A SLOPE = 150 OHMS SNC1D | Miss. Manaktola

  11. Next class: • Quiz! (5 minutes) • You will be doing a Lab on Ohm’s law • Read investigation 10-11 (page 320) in your textbook SNC1D | Miss. Manaktola

  12. SNC1D | Miss. Manaktola

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