What can affect the brightness of bulb(s) in a circuit?

• The brightness of a bulb in a circuit depends on the:

         -arrangement of batteries
         -number of batteries
         -number of bulbs
         -arrangement of bulbs
Arrangement of Batteries

• The batteries in a circuit may be connected in series not connected or parallel.

Batteries in series

• When the positive pole of a battery is connected to the negative pole of another battery, the batteries are connected in series.

Batteries in Parallel

• When the batteries in a circuit are arranged in parallel:

          - the positive poles of all the batteries are connected together, and then connected to one end of the circuit.    

          - the negative poles of all the batteries are connected together, and then connected to the other end of the circuit.