High voltages are desirable for long distance transmission of electric power because
A. the higher the voltage the higher the current, which reduces the power lost
B. the higher the voltage, the lower the current, which reduces the power lost
C. the higher the voltage the less concern there is for safety
B. the higher the voltage, the lower the current, which reduces the power lost
You might also like to view...
When an ideal gas undergoes a slow isothermal expansion:
A. the work done by the gas is the same as the energy absorbed as heat B. the work done by the environment is the same as the energy absorbed as heat C. the increase in internal energy is the same as the energy absorbed as heat D. the increase in internal energy is the same as the work done by the gas E. the increase in internal energy is the same as the work done by the environment
A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
a) friction does no work at all b) friction does negative work c) friction does positive work
At what temperature is the rms speed of hydrogen molecules, which have a molecular weight of 2.02 g/mole, equal to 2000 m/s?
A) 17.0°C B) 34.0°C C) 51.0°C D) 68.0°C E) 72.0°C
Planck's constant
A) sets an upper limit to the amount of energy that can be absorbed or emitted. B) sets a lower limit to the amount of energy that can be absorbed or emitted. C) relates mass to energy. D) determines the value of the gravitational constant.