As an AI language model, I can assist you in solving the problems and providing a schematic diagram for each problem. However, I cannot draw a diagram at the moment due to text nature of this environment. Here are the solutions to your problems: 1. To find the total resistance in a series circuit, add the resistance values of each resistor. Thus, the total resistance in this circuit is 650 + 350 + 1000 = 2000 ohms. 2. To find the total resistance in a series circuit, add the resistance values of each resistor. Thus, the total resistance in this circuit is 10 x 120 = 1200 ohms. 3. In a series circuit, the total resistance is simply the sum of the resistance of each bulb. Thus, the total resistance is 50 x 15 = 750 ohms. 4. To find the total resistance in a parallel circuit, use the formula: Rt = 1/ (1/R1 + 1/R2). Thus, the total resistance in this circuit is 1/ (1/180 + 1/180) = 90 ohms. 5. To find the total resistance in a parallel circuit, use the formula: Rt = (R1 x R2 x R3) / (R1 x R2 + R2 x R3 + R1 x R3). Thus, the total resistance in this circuit is (10 x 20 x 100) / (10 x 20 + 20 x 100 + 10 x 100) = 6.67 ohms. 6. In a parallel circuit, the total resistance is calculated using the formula: Rt = R1 / n, where n is the number of resistors in the circuit. Thus, the total resistance in this circuit is 15 / 50 = 0.3 ohms. 7. To find the total current in a circuit, use the formula: I = V / R, where V is the voltage and R is the resistance. Thus, the total current in this circuit is (1.5 V) / (100 + 100) = 0.0075 A. 8. To find the total current in the circuit, use Ohm's Law, which states that current (I) = voltage (V) / resistance (R). Since the total resistance of the string is 750 ohms (from problem 3), and the source voltage is 115 V, the total current in the circuit is (115 V) / (750 ohms) = 0.153 A. 9. To find the total current in the circuit, use Ohm's Law, which states that current (I) = voltage (V) / resistance (R). Since the total resistance of the string is 0.3 ohms (from problem 6), and the source voltage is 115 V, the total current in the circuit is (115 V) / (0.3 ohms) = 383.33 A. 10. To find the total current in this circuit, use Ohm's Law, which states that current (I) = voltage (V) / resistance (R). Since the total resistance of the circuit is 3.6 ohms (the sum of three 1.2 ohm lamps in series), and the source voltage is 3 V, the total current in the circuit is (3 V) / (3.6 ohms) = 0.833 A. 11. Since all three lamps are identical and connected in series, the voltage drop across each lamp is split evenly. Thus, the voltage drop across each lamp is (6 V) / (3 lamps) = 2 V.