In which technique is the frequency of a carrier signal varied according to the amplitude of an information-bearing signal?

How does the total capacitance of two capacitors arranged together in series compare to the individual capacitances of each?

Which of these devices has a rectifying metal-semiconductor junction?

Which of these has no P-N junctions?

Which of the following statements is certainly true about two capacitors that have been charged in parallel?

True or False: The ratio of visible light produced to power consumed is more for LEDs than for incandescent light bulbs.

How does the total capacitance of two capacitors arranged together in parallel compare to the individual capacitances of each?

In a circuit consisting of a battery in parallel with two identical parallel resistors, how do the currents through the two resistors compare?

Which of the following are appropriate units for capacitance?

In a step-down transformer, which is larger ?

Which of the following are appropriate units for resistance?