A circuit contains two lamps connected in series. What would happen to the brightness of each lamp if two more lamps were added? Explain

The brightness of the lamps would decrease. This is assuming that the lamps are wired in a series circuit and not a parallel circuit.

Sample Response: If two more lamps were added to the circuit, the brightness of the lamps would decrease. The brightness of the lamps decreases because adding more lamps to the circuit increases the resistance, which decreases the current.