WEEK09 - Output Devices¶
This week was Input Devices. We all worked individually on our devices and decided to measure and probe a phototransistor on our boards for the group Assignment.
WEEK NINE ASSIGNMENT¶
| Assignments | Completed |
|---|---|
| GROUP | |
| - measure the power consumption of an output device | ok |
MEASURING SPEAKER¶
Power = V x I ( Watt)
for voltage that looks like this on an oscilloscope:
_ _ _ _ _
_| |_| |_| |_| |_| |_
this means that the voltage is changing this means that you cannot use a multimeter to measure the power consumption accurately in this instance. You HAVE to use an oscilloscope for non-static energy
The speaker output was not so easy to measure: –> place one end on the GND –> place second end on the resistor
But this kind of proved more difficult than we thought, somehow it just didn’t work right. So in favour of supply-sight time-management we moved on to measuring and LED which can indeed be measured using a multimeter
MEASURING LED¶
To measure the LED still the same formula applied.
first we measured the sVolt –> then we measured the LED = 2.8 Volt
( you have to measure both the volt and the current (amphere))
Volt: 2.8 V Current: 1.63 mA.
Formula: PW = V x I
= 4.564 Watt ( this is the powerconsumption of the LED)