The electrical resistance of a circuit changes depending on whether the resistors are connected in series or parallel. A circuit connected in parallel is shown below. +O R (1009) R (2009) R3 (3009) Figure 5: Three resistors connected in parallel. For resistors connected in parallel, the total resistance, Rr is: 1 1 1 1 +=+ RT R R R3 a) Calculate the total resistance, Rr for the circuit shown above. b) The total resistance of 2 parallel resistors is found by evaluating the expression: RTOTAL = RR R + R If in this case the total resistance, RTOTAL is 1200 and R is 2400, what will be the value of R?