LLesson+41+&+42+Lab

**﻿Advancememt in Physics @ Dwight Englewood** **Director: Elise Burns** **TA: Sebastian Luhol****﻿**

**Objective One**: What is the relationship between pressure difference and flow rate? **Objective Two**: What is the relationship between pressure difference and flow rate?

**Hypothesis**: There is going to be a linear relationship between pressure difference and flow rate as well as the light bulb.

__Discussion Questions:__ **1. In terms of experimental data, how is resistance defined and what are the units?** The units are ohms. Resistance in this situation means that resistance blocks the flow of electricity **c) How would flow rate through this resistor change as the pressure difference decreases?** The current would increase.
 * 2. Imagine that you had a third resisor that has a much smaller resistance than the ones used in the lab activity? **
 * a) Sketch a graph of pressure distance vs. flow rate that shows your 2 original resistors and the new resistor. Clearly label the lines. **
 * b) E ****xplain why you drew it this way.** I drew it this way because our R2 was 4700 which was a high resistance. and R1 was only 1000 which was less steep. I drew R3 closer and more of a straight line to the x-axis because if it had even less than these 2 values, it shows that it would have to be a less steep incline and more flat.
 * 3. Assume that resistor A has 10 times the resistance of resistor **
 * 3A. What would a graph of resistance vs current look like? **The graph would not change significantly.

<span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">**3B. What about a graph of resistance vs voltage?** The resistance vs. voltage graph would stay the same because the resistance does not change.

<span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">**4**. **While cooking dinner, the schools dining hall oven used a 220 volt line and draws 10 A of current when heated to its max temp. What is the resistance of the oven when it is fully heated?** 220V/10A=22ohms
 * <span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">5. A 9 volt battery is connected to a 6 omega resistor. What will the flow rate be through the resistor? **<span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">R= v/I, 6=9/I , =3/2A , 1.5 A
 * <span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">6. Is this resistor ohmic or non ohmic? **<span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">Ohmic
 * <span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">7. What is the resistance of the object from which this data was collected? **<span style="color: #ff0055; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">R= V/, R= 1.5/5 , R=.3 ohms