12. Output devices

This week, as a group assignment, examine the power consumption of the circuit.

Research

The power consumption is obtained by the following formula. W = V × A

If power consumption is multiplied by time, it will become power consumption every hour. Wh = W × h

An example of power consumption in Japan. In Japan, the basic rate changes depending on the number of amps to be contracted.

Amps	BasicRate
10A	¥280.80
15A	¥421.20
20A	¥561.60
30A	¥842.40
40A	¥1,123.20
50A	¥1,404.00
60A	¥1,684.80

And the rate of wattage per hour is changed in three steps

kWh	Rate
0 - 120	¥19.52
120 - 300	¥26.00
300-	¥30.02

Useful links

• wikipedia
• Electoricaly Rate Plans In Japan

Instruments

• Output device

  • Peltier Element
  • Spec
    • 12V
    • 5A
  • Internal resistance
    • 2.4〜2.7Ω
  • 12V / 2.5Ω = 4.8A ≠ 5A

• Measuring tools

  • DC Power supply
  • Non-contact Thermometer

Check the power consumption by increasing 2V from 1V

• 0V
  • 
• 1V → 0.27A
  • 
• 3V → 0.75A
  • 
• 5V → 0.98A
  • 
• 7V → 1.40A
  • 
• Table
  • 

By measuring the temperature, I was thinking about examining the relationship between power consumption and temperature.
However, when the measurement took time, the temperature rose during that time.
As a result, at 7 V, the Peltier element was destroyed and no current flowed.

Power consumption of Peltier device (TEC-12705)

Power consumption and charge for 1 hour at each voltage

Voltage	Ampere	Killo Watt per Hour	Charge
1V	0.27A	0.00027kWh	¥0.00527
3V	0.75A	0.00225kWh	¥0.0585
5V	0.98A	0.0049‬kWh	¥0.095648
7V	1.40A	0.0098kWh	¥0.191296