A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has
A) 1/5 as many turns.
B) 5 times as many turns.
C) the same number of turns.
D) none of the above
Answer: A
You might also like to view...
A lunar eclipse that occurs when the Moon moves completely into Earth's umbral shadow is called a _____
A) total solar eclipse B) penumbral lunar eclipse C) partial solar eclipse D) total lunar eclipse
The lift on an airplane wing is an application of
A) Bernoulli's principle. B) Pascal's principle. C) Archimedes' principle. D) Poiseuille's equation. E) Torricelli's equation.
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. According to this equation, if the mass of the second object were greater, what happens to the gravitational force between them?
A) The force increases. B) The force decreases. C) The force drops instantly to zero. D) The gravitational force is not affected by the mass of the second object.
The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in
A) radio emission from H atoms. B) short wavelength infrared light from most of the stars. C) visible light, which is closest to how the night sky appears from Earth. D) x-rays from hot gas bubbles in the disk. E) gamma ray from cosmic-ray collisions with gas atoms.