1. Signal Generator 1.Describe what each control on the CRO does. 2.Describe a method for finding peak voltage. 3.Describe a method of finding the period (time for one wave), then the frequency of the wave. Frequency = 1 ÷ period NB. period must be in seconds, beware of milliseconds, ms Tutorial Questions ac Qu 5 and 6 Virtual oscilloscope

2. Experiment: Comparing a.c. and d.c. Adjust the ac power supply to light the bulb. Use a CRO to find the peak voltage, V P. Switch to d.c. and adjust the resistor to get the same brightness of bulb. Find the d.c. voltage, V dc. V P in voltsV dc in voltsV P ÷ V dc 6 V d.c a.c. CRO

3. V peak = √2 V RMS I peak = √2 I RMS Root mean square - the equivalent dc value of an ac source. ie a light would be the same brightness P = IV Tutorial Questions 1 to 3 SAQ booklet pages 1 to 11