1. Which of the following can a transformer accomplish?
(a) Changing voltage but not current.
(b) Changing current but not voltage.
(c) Changing power.
(d) Changing both current and voltage.
2. A laptop computer's charger unit converts 120 V from a wall power outlet to the lower voltage required by the laptop. Inside the charger's plastic case is a diode or rectifier (discussed in Chapter 29) that changes ac to dc plus a
(a) Battery.
(b) Motor.
(c) Generator.
(d) Transformer.
(e) Transmission line.