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Today’s Circuit

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?. Ohm’s Law and Graphing. V R I. calculating Resistance.

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Today’s Circuit

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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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