Question

Question 7 1 pts High voltages are used for long-distance electrical power transmission because more voltage means more power. high voltage prevents people from stealing the electricity. wires are better conductors at high voltages. the low currents allowed by high voltage means less power lost as heat in the wire.

Answer 1

Question 8 = We know from the definition of boiling point that Boiling point of a liquid is the temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure ( the air pressure) outside the liquid.

In Vacuum , there is no atmospheric pressure, that is the outside pressure on the surface of the liquid is zero. So the boiling point is achieved at a very low temperature instead.

So we can say that the vapour pressure in the water bubble exceeds the water pressure when the pressure is removed.

Therefore option (d) is correct.

Question 7 is solved below.

We know that the Power Loss when current I is transmitted through a power line (wire og smistame R is quiseo by : Power loss = I2R Also, we know that at current I and voltage V, the power transmited. I wis guies by Pa VI I = ? v Power loss here will be = I2R P2 R r2 Hence, we see that for a given power lines I and R will be So lower loss a inversely constant , proportional to Val the . If power transmitted is at high voltage power loss will be small, because the higher voltage, lower the current hence the power loss or vice-versa, and