Aim: To determine the angular speed of fan at different positions of the regulator knob.

Apparatus: Ceiling fan, stop watch

Introduction:

Have you ever wondered about the relation between the angular speed of a fan and the five step regulator knob. In this activity we will explore this relation. We have recorded the videos of a fan (in slow motion video mode of the smartphone) with regulator knob positions changing from 1 to 5. You are expected to generate the data from these videos and plot a graph between the angular speed of the fan and the knob position.

Procedure:

From the videos given below, generate the data for angular speed of the fan at different regulator knob positions with 1% uncertainty in the measurement.

Plot a graph between angular speed of the fan and the regulator knob position.

3. You can also download the videos by clicking on the links below:

Use spreadsheet for calculations, if needed: spreadsheet

Download the graph sheet given below to plot the graph: Graph Sheet

Note:

What is meant by 1% uncertainty in the measurement of data?

When we say that we want to measure a variable, y with 1% uncertainty, it means that

It means that the measured quantity is at least 100 times the least count.

Extra Work:

Repeat the same procedure for the ceiling fan at your home and plot the graph between the angular speed and knob position. Is there a change in the nature of the graph?