F.2 I.S (Series and Parallel Circuits)

Please refer to the following circuit diagram and answer the questions.

圖片參考：http://hk.geocities.com/poonroger12/circuit.JPG

1) Which of the above electrical components are connected in the main loop?

2) Which of the two electrical components are connected in parallel?

3) Apart from moving the sliding contact of the rheostat, please suggst ONE way to increase the reading of the ammeter.