What is the device shown in figure "B" of...

🔍 Key Concepts

• Notice the single winding with taps at 25%, 50%, and 75% – think about what kind of device uses one coil with multiple voltage points instead of separate primary and secondary windings. • Compare a simple inductor/choke (used for filtering or power factor) with a transformer-type device that can change voltage levels for the load. • Look at how source current and the labeled “XFMR current” share the same winding segment – this is a clue about the device’s basic construction.

💭 Think About

• Does a fluorescent ballast, power factor inductor, or noise choke normally have multiple taps marked in percentage of winding, or is that more typical of something used to vary voltage? • If one winding is serving both the source side and the load side, what family of transformer does that suggest, compared to a standard two-winding transformer? • Which choice describes a device that can provide different output voltages (like 25%, 50%, 75%) to a load from the same winding?

✅ Before You Answer

• Verify which option is a transformer with a single tapped winding shared between input and output. • Eliminate any options that are just simple series inductors without multiple taps or transformer action. • Confirm which device is commonly used between a breaker and a load to adjust voltage level rather than only to correct power factor or filter noise.

What is the device shown in figure "B" of the illustration between the source circuit breaker and the load? Illustration EL-0083

fluorescent light ballast

power factor correction inductor

autotransformer

noise filtering choke

🔍 Key Concepts

💭 Think About

✅ Before You Answer