Answer:
1. Bulbs 3 and 4 would be brightest because they are connected in parallel.
2. In the series circuit, the same current flows through bulbs 1 and 2. In other circuits, the current splits; flows through the each bulb and merges back to initial value.
Explanation:
1. Two or more bulbs can be connected either in series or parallel in a circuit.
Series connection implies that the same current, I flows. In parallel circuit, the current splits so that the same voltage flows in the circuit. The complex circuit consists of both series and parallel connections.
Because they are connected in parallel only, bulbs 3 and 4 would be the brightest. The brightness of two or more bulbs is affected when connected in series.
2. In the series circuit, the current, I would flow through each bulb 1 and 2.
ii. In the parallel circuit, the current splits into two parts (at the initial junction) with each part flowing through 3 and that of 4 then merges at the other junction.
iii. In the complex circuit the current splits up at the junction, but the same current flows through 5 and 6 while the other fraction flows through 7.
