The expected answers were:

1. (i) R1 and R2 in series, RT = R1 + R2

(ii)R1 and R2  in parallel
RCD =

1. RAB =

       =
       = 6Ω
   RT = 4Ω + 6Ω
        = 10Ω
IS  =
    = 1A
I   =
    = 0.4A
V = IS x 4 Ω = (1 x 4)V
    = 4V

For this question, three important theorems of circuit theory were required; namely: equivalent resistance for resistors connected in parallel and in series, Ohm’s law, and the current divider law. The question was popular. The performance was very encouraging.