1. Look at the RC circuit below. The voltage across the resistor is 2.0V (rms). The voltage across the capacitor is 2.5V (rms). Do now: Rātapu, 13 Mahuru 2015 Find: 1) The RMS current in the circuit 2) The supply voltage, V S 3) The phase difference between the supply voltage and the current

2. RC Circuits The total voltage in the circuit can be found by adding the V R and V C phasors together VRVR t ω VCVC VRVR VCVC VsVs VSVS

3. Homework: Sets 3 (Induction) should be finished Set 4 (AC circuits) due Week 1, Term 4 Electricity “Exam” Friday 18 th Oct (Week 1, Term 4) Study Skills Evening This Thursday, 26 September, 7:30pm in Library Who has finished Activity 16C?

4. Today’s Kaupapa: LO 24) Use phasor diagrams to calculate the voltage and impedance of RC circuits Board notes: then Activity 16D

5. Look at the circuits below. The same resistor and capacitor are used in the RC circuit. Find: 1) The resistance, R, of the resistor circuit 1 2) The reactance, X, of the capacitor circuit 2 3) The capacitance, C, of the capacitor circuit 2 4) The impedance, Z, of the RC circuit 3 5) The current in the RC circuit 3