Why does the brightness of a bulb not change noticeably when you use longer copp

Question

Why does the brightness of a bulb not change noticeably when you use longer copper wires to connect it to the battery? (Select all that apply.) All the current is used up in the bulb, so the connecting wires don't matter. Very little energy is dissipated in the thick connecting wires. Electric field in the connecting wires is zero, so emf = E_bulb L_bulb. Current in the connecting wires is smaller than current in the bulb. The electric field in connecting wires is very small, so emf almostequalto E_ bulbL_bulb.

Explanation / Answer

Solution: Very little energy is dissipated in the thick connecting wires.

As resistance is inversely proportional to length of wire, so less energy dissipated by the wire and more energy dissipated by the bulb. The resistance of wire is low enough to not cause a sufficient drop in voltage across the wires, so there is no noticeable difference in voltage across the bulb. The electric field in connecting wire is very small, so

Emf ~ Ebulb x Lbulb

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