Experimenting Model

Our main objective in designing the model is to determine the motor curve and efficiency curve. We provide 2 different constant input power to the motor with 2 value of voltage and current;

a) 3 V - 400mA : Input Power = VI = 1.2W

b) 4.5 V - 400mA : Input Power = VI = 1.8W

We used 5 types of variable masses that is 45.7g, 74.0g, 95.6g, 119.7g, 162.0g.

We calculate the efficiency by using:

e=(Power Output/Power Input) x 100%

Power output = F.v

= mgv

Procedur step:

1. The adapter is swicthed into 3V with 400mA of current.

2. A load with a certain mass was placed to the hook supported by the load column.

3. The switch is turned on and the time taken, t for the load to reached 0.35m is recorded.

4. Step 3 is repeated 2 times and the average value of t is recorded.

5. Step 2 to 4 is reapeated by using another 4 types of masses.

6. Step 1 to 5 is repeated again by using 4.5V with 400mA of current.