A simple inverter consists of one of these components with a DC input in one part. The parameters of one of these devices are determined using the open-circuit and short-circuit tests. These devices' energy losses are sub-divided into copper losses and iron losses. The root-mean-square output of these devices equals approximately 4.44 times the frequency times area times magnetic field times N. An example of the resonant kind of these devices is the (*) Tesla coil. The equation governing these components sets the ratio of the number of turns in the two coils equal to the ratio of the voltages 
A simple inverter consists of one of these components with a DC input in one part. The parameters of one of these devices are determined using the open-circuit and short-circuit tests. These devices' energy losses are sub-divided into copper losses and iron losses. The root-mean-square output of these devices equals approximately 4.44 times the frequency times area times magnetic field times N. An example of the resonant kind of these devices is the (*) Tesla coil. The equation governing these components sets the ratio of the number of turns in the two coils equal to the ratio of the voltages in the winding. For 10 points, name these alternating circuit components containing a pair of inductively-coupled coils that steps down or steps up an input voltage.
A simple inverter consists of one of these components with a DC input in one part.
transformer