A) Two types of circuit connections are:

Here is the solution to question 4:

a) Two types of circuit connections are:

• Series connection
• Parallel connection

b)

i) To achieve a series connection of the 10 $\Omega$ and 20 $\Omega$ resistors:

• Close switch S1.
• Open switch S2. In this configuration, the current flows from the power source, through S1, then through the 10 $\Omega$ resistor (as S2 is open), and finally through the 20 $\Omega$ resistor before returning to the source. Thus, the 10 $\Omega$ and 20 $\Omega$ resistors are connected in series.

ii) To achieve a parallel connection of