The output power of a hydropower station is 20kW, the transmission voltage is 400V, and the total resistance of the wire is 0.5 Ω. What is the power loss of the transmission line? What is the electric power that users get?

The output power of a hydropower station is 20kW, the transmission voltage is 400V, and the total resistance of the wire is 0.5 Ω. What is the power loss of the transmission line? What is the electric power that users get?

According to P = UI: I = Pu = 20000400a = 50a, then the power loss on the transmission line is: P loss = I2R = 2500 × 0.5W = 1250W, then the electric power obtained by the user is: P consumption = P-P loss = 20000-1250w = 18750w. Answer: the power loss on the transmission line is 1250W, and the electric power obtained by the user is 18750w

A power plant transmits electricity to a school through a long distance, and the transmitted electric power is p. when the resistance of the transmission line and the transmitted electric power remain unchanged, the following statement is correct ()
A. The higher the transmission voltage, the greater the voltage loss on the transmission line. B. the voltage loss on the transmission line is directly proportional to the transmission current. C. the power loss on the transmission line is directly proportional to the square of the transmission voltage. D. the power loss on the transmission line is inversely proportional to the square of the transmission voltage

A. Therefore, a is wrong. B. the voltage △ u = IR on the transmission line is directly proportional to the current. Therefore, B is correct. C. the power loss on the transmission line is P loss = I2R = p2u2r, which is inversely proportional to the square of the transmission voltage. Therefore, C is wrong and D is correct. Therefore, BD is selected

In the process of electric energy transmission, if the electric power transmitted and the resistance of the transmission line are fixed, there are four kinds of judgments about the electric power lost on the transmission line, the correct one is ()
A. It is directly proportional to the transmission voltage B. It is directly proportional to the current on the transmission line C. It is directly proportional to the voltage drop on the transmission line D. It is inversely proportional to the square of the transmission voltage

A. According to P = UI, I = Pu, then the electric power lost on the transmission line P loss = I2R = (PU) 2R, the power lost is inversely proportional to the square of the transmitted voltage, and is directly proportional to the square of the transmitted current. So a and B are wrong, D is correct. C, the power lost on the transmission line P loss = △ u2r, the electric power lost is directly proportional to the square of the voltage drop on the transmission line

When the voltage at both ends of a resistance wire is u, the electric power consumed is p. if the voltage at both ends of the resistance wire is reduced to half of the original voltage, the electric power consumed is
A half p
B quarter p
C three quarters p
D O

P = u / R & # 178; select a
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