If only the gas is heated and not allowed to expand, how will the internal energy of the gas change? If the heat is not transferred to the gas and the gas is required to work outwards, how will the internal energy of the gas change

If only the gas is heated and not allowed to expand, how will the internal energy of the gas change? If the heat is not transferred to the gas and the gas is required to work outwards, how will the internal energy of the gas change

1. If there is no expansion, there is no work to do, so heating (endothermic gas) will inevitably lead to the increase of internal energy
2. If a gas wants to do external work, the source of work can only be the internal energy of the gas

The resistance wire of an electric furnace is broken. After a quarter of it is removed, it is connected to the original circuit. How much heat is generated in the same time compared with the original one?

Because Q1 = u & # 178; t / R1, Q2 = u & # 178; t / R2, Q1: Q2 = R2: R1, R1 = ρ L / s, R2 = ρ (3L / 4) / s, R1: R2 = 3:4, R2: R1 = 4:3, Q1: Q2 = R2: R1 = 4:3 A: slightly. Hope to help you. If you have any questions, you can ask ~ ~ ~ I wish you progress in your study and make a better progress! (*^__ ...

In the long-distance transmission of electric energy, if the transmission power remains unchanged, the resistance of the transmission line remains unchanged, in order to reduce the loss of electric energy on the line, the electric energy from the power station
Why is it that when the voltage is raised, the current becomes smaller instead, and the voltage is not proportional to the current
In the long-distance transmission of electric energy, if the transmission power and the resistance of the transmission line remain unchanged, in order to reduce the loss of electric energy on the line, the electric energy from the power station must first increase the voltage through the transformer, so as to reduce the current through the transmission line

In pure resistance circuit, the voltage is proportional to the current because u = IR is satisfied
In the actual process of electric energy transmission, there are all kinds of electrical appliances at the end of the power consumption, so it can not be pure resistance circuit (and motor). At this time, it is transmitted according to the amount of electric energy consumption, that is, assuming that the electric power is constant, P = UI is always true under any conditions. At this time, u is inversely proportional to I. the smaller I is, the less energy is lost in the wire part (because the wire in the trunk road is pure resistance circuit part)

The output power from the power station is 200kW, and the total resistance of the transmission line is 0.05 Ω. Two kinds of voltage, 110V and 11kv, are used for transmission. Try to estimate two kinds of situations
The output power from the power station is 200kW, and the total resistance of the transmission line is 0.05 Ω. Two kinds of voltage, 110V and 11kv, are used to transmit power. The voltage loss caused by the resistance on the transmission line under the two conditions is estimated

At 110V, I1 = 200kW / 110V = 1820a, voltage loss U1 = i1r = 1820a * 0.01 Ω = 18.2v
At 11kv, I2 = 200kW / 11kv = 18.2A, voltage loss U2 = I2R = 18.2A * 0.01 Ω = 0.182v