The output voltage of a generator is 220 V, the output power is 110 kW, and the electric energy is transmitted to the distance by a wire with a total resistance of 0.3 ohm (1) What is the power loss on the transmission line if the voltage is directly 220 V? (2) what is the power loss on the transmission line if the voltage is increased to 6000 V by transformer

The output voltage of a generator is 220 V, the output power is 110 kW, and the electric energy is transmitted to the distance by a wire with a total resistance of 0.3 ohm (1) What is the power loss on the transmission line if the voltage is directly 220 V? (2) what is the power loss on the transmission line if the voltage is increased to 6000 V by transformer

(1)I=P/U=500A
P loss = I ^ 2 * r = 75000w
(2)I'=P/U'=18.33A
P loss = I '^ 2 * r = 100.83w

The resistance of an electric furnace is 48.4 Ω. How much work does the current do when it is connected to a 220 V circuit and energized for 5 minutes?

Current work w = u2rt & nbsp; = (220V) 248.4 Ω × 300s = & nbsp; 3 × 105J

There is an electric stove with the specification of "220 V 800 W" connected to the home circuit and used for one hour
(1) How much heat is consumed by the wire? (2) how much heat is released by the wire? (3) what is the amount of charge passing through the wire
Please master solution, online and so on.

（1）W=Pt=800w * 3600s=2880000J.
(2) Because the electric furnace can be used as a pure resistance circuit, so w = 800W
(3) R = u ^ 2 / P = 60.5 (Euro), I = u / r = 440 / 121 (a)
From the formula q = it = 13090 (c)

With a "220 V 800 W" electric stove connected to a 220 V household circuit, 75% of the heat generated by the electric stove is absorbed by water. Under normal circumstances, how long does it take to boil a pot of water with a temperature of 20 ° C and a mass of 2 kg?

Let t be the required time, then
W electric furnace * t * 75% = cm Δ t
Get by substitution
800 * T * 0.75 = 4200 * 2 * (100-20)
T = 1120s