Week 09 - Output devices

Group assignment:

• measure the power consumption of an output device

Fan

For group assignment, I’ve tested Power consumption of a fan, I set Voltage at 12V as stated on the device. I added current progressively and the fan started to turn at 0.231 A and then the current drop under 0.170 A.

I lowered the current after that and the fan still turns but much slower.

I also tested augmenting the Voltage up to 13 V and it’s making the fan turning faster.

Stepper motor

In order to make our group assingments, we tested different components with the workshop power supply, for my part, I chose to test the stepper motor that I tried out. To do this, I always kept the same set-up, varying the current as well as the voltage. I noted the results in the form of a table.

Current	Reaction
0.003	you can hear clicks
0.035	Starts to vibrate
0.049	Start to move
0.07	The motor is silent
0.08	Motor no longer vibrates

However, when I carried out these tests, the voltage dropped by itself to 4.6 and the motor, although running very well, had almost no torque. So I started again with 12 volts and more current up to 1 amp. The more current I added, the more torque I got.

LED

Another material commonly used in electronics is LEDs. We use addressable LEDs, with an indication voltage of 12V and 2A. First, I set the power supply to 1A and connect the LED strip. When I switch it on, all the current is drawn (0.999 and a red light) so I have to increase it.

I’ve increased the current beyond that indicated (to 2.5A) and the result is as expected: consumption is 2.047Ah.