series ac circuits
The current in a resistive circuit depends on the applied voltage. The current is always in phase with the voltage regardless of the number of resistors in the circuit. At any point in the circuit, the current has the same value.
Figure 23-3 shows a simple series ac circuit. The current flow is the same through both resistors. Using Ohm’s law, the voltage drop across each resistor can be determined. The voltage drops added together equal the applied voltage. Figure 23-4 shows the phase relationships of the voltage drops, the applied voltage, and the current in the circuit. All the voltages and the current are in phase with one another in a pure resistive circuit.
example: If an AC circuit has an effective value of 120 volts applied across two resistors (R1 5 470 ohms and R2 5 1000 ohms 2 , what is the voltage drop across each resistor?
