1. which letter represents the location of the battery in this diagram?

1.a

2. b

3.c

4.d

which letter represents the location of the switch in this diagram?

1. a
2.b
3.c
4.d

1. The battery is represented by the symbol next to letter A.  The plus and the minus signs indicate the positive and negative poles of the battery, respectively.

2. The switch is represented by the symbol next to letter B. Here, the switch is closing the circuit, that is, there is electric current circulating.