(a) A 20 2 resistor is connected in series with unknown resistor,Rx to a 200 V supply voltage. If the current drawn is 4 A, find the value of Rx. (b) Two resistors 12 ohm and 6 2 are connected in...

Extracted text: (a) A 20 2 resistor is connected in series with unknown resistor,Rx to a 200 V supply voltage. If the current drawn is 4 A, find the value of Rx. (b) Two resistors 12 ohm and 6 2 are connected in parallel and this combination is connected in series with a 6.5 2 resistance. Suppose the circuit is connected to a battery. Determine the voltage of the battery if the potential difference across 6 2 resistance is 6 V. (c) Resistance R is connected in series with a parallel circuit comprising two resistors of 80 and 12 2. If the applied voltage is 20 V and the total power dissipated in the circuit is 70 W, determine the value of R.