Strompreise:

P = U * I (Elektrische Leistung)

W = P * t (kilo Watt Stunden)

https://bk-ostvest.lms.schulon.org/pluginfile.php/15381/mod_resource/content/1/AB%20Stromkosten.pdf

1.)
geg: Pspeedport = 36W;  PC = 140W; TFT-Monitor = 40W; Strompreis = 0.20€/kWh; trouter = 10 h; tpc = 8h;
ges: W gesamt; Preis Gesamt;

Wn = Pn * t
Wspeedport = 0,036kW * 10h = 0,36/kWh
Wtft = 0,045kW * 8h = 0,36/kWh
Wtftalle = 0,36/kWh * 8 = 2,88/kWh
Wpc = 0,14kW * 8h = 1,12/kWh
Wpcalle = 1,12 * 8 = 8,96/kWh

Wgesamt = wspeedport + wtftalle + wpcalle
wgesamt = 0,36/kWh + 2,88/kWh + 8,96/kWh = 9,67/kWh pro Arbeitstag

2.)
geg: Wrouterpc = 145W; Wtft = 40W; Wpc = 140W Trpc = 10h; tpc = 8h;
ges: Wgesammt;

W = P * t

wrpc = 0,145kW * 10h = 1,45/kWh
Wtft = 0,045kW * 8h = 0,36/kWh
Wtftalle = 0,36/kWh * 8 = 2,88/kWh
Wpc = 0,14kW * 8h = 1,12/kWh
wpcalle = 1,12 * 7 = 7,84/kWh

Wgesamt = 1,45/kWh + 2,88/kWh + 7,84/kWh = 12,17/kWh