Lamps in domestic lightings are usually in

Step 1: Analyze the question The question asks how lamps are connected in household (domestic) wiring. The choices are about circuit arrangement. "Divergent" and "convergent" describe light rays or lenses, not circuits, so they can be eliminated right away.

Step 2: Explain the concept There are two ways to connect components in a circuit:

• Series: the components are connected end to end in a single path. The same current flows through all of them, and the supply voltage is shared among them.
• Parallel: each component is connected across the same two points, so each has its own path. Every component gets the full supply voltage.

Step 3: Apply it to domestic lighting Nigerian household supply is about 230 V (mains). Lamps are rated for this voltage, so each lamp must receive the full voltage. Parallel connection gives this.

Parallel connection also has these advantages:

1. Independent operation: if one lamp burns out or is switched off, the others stay on. In series, one broken lamp would break the circuit and put out all the lamps.
2. Constant brightness: each lamp gets the full voltage, so adding more lamps does not dim the others. In series, adding lamps would make them all dimmer.
3. Separate switches: each lamp or room can have its own switch.

Step 4: Answer Lamps in domestic lighting are usually connected in parallel, which is option D.

Exam tip: Remember "House = Parallel". If a question mentions household wiring, think of parallel connection, because every appliance needs the full mains voltage and must work independently. Also, whenever you see "convergent" or "divergent" in a circuits question, it is a distractor, since those words belong to optics.