21 ) A 5 Ohm resist or and a 7,Ohm resis tor are wired in se ries and hm connecte stor and to supply.at 15 the powel dissipate and the 7 Ohr n resist or? (1) 52 Watts b) 57 W atts c) 89 Watts d) 30 Watts (L4.5

## Step1: In this question, there are two resistors wired in series to a 25 volt supply. Since they are in series, the total resistance (R_T) of the circuit is the sum of the two resistances. So, we calculate,### ## Step2:With a total resistance and voltage (V) known, we use Ohm’s law (I = V/R) to calculate the current in the circuit.### Since the resistors are wired in series, the current that flows in them is the same.## Step3:The power (P) dissipated by a resistor can be computed using the formula . Substituting the current ( ) and resistance ( ) into this formula gives us the power dissipated by the 7 Ohm resistor.### \(P = (2.1 A)^2 \times 7 \Omega = 30.1 W \approx 30 W\) when rounded to a proper significant figure.