torioricker
05.07.2019 •
Physics
20. there are two electrical devices, one is electrical kettle of 2kw-200v and
next one is electrical heater of 1kw-240 v. which device has highest
resistance?
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Ответ:
Electrical kettle:
P = 2 KW = 2000 W
U = 200 V
⇒ I = P/U = 2000 / 200 = 10 A
We apply the Law of Ohm:
R = U / I = 200V / 10A = 20 Ω
Electrical heater:
P = 1 KW = 1000 W
U = 240 V
⇒ I = P/U = 1000 / 240 = 4,16 A
We apply the Law of Ohm:
R = U / I = 240V / 4,16A = 57,69 Ω
The device with the highest resistance is the electric heater.
.
Ответ:
from where to where should we answer to