17. A 4.0 9 resistor, an 8.0 2 resistor, and a 12 2 resis- tor are connected in series with a 24 V battery. Determine the following: a. the equivalent resistance for the circuit b. the current in the circuit (See Sample Problem 20A.) nolog s 18. The resistors in item 18 are connected in parallel across a 24 V battery. Determine the following: a. the equivalent resistance for the circuit b. the current in the circuit (See Sample Problem 20B.) 19. An 18.0 92 resistor, 9.00 2 resistor, and 6.00 2 resis- tor are connected in parallel across a 12 V battery. Determine the following: a. the equivalent resistance for the circuit b. the current in the circuit ( See Sample Problem 20B.)