What is the voltage and frequency of the mains AC supply?
230 V, 50 Hz
How can the frequency of an AC supply be measured?
Using an oscilloscope
What is the formula to calculate frequency from period?
f = 1/T, where f is frequency in hertz (Hz) and T is period in seconds (s)
What does the peak voltage of an AC signal represent?
The maximum voltage reached by the supply
How can peak voltage be determined from an oscilloscope?
It can be read directly from the oscilloscope screen
What does r.m.s. voltage represent?
The value of an AC voltage that delivers the same amount of energy as a DC voltage
Can r.m.s. voltage be measured directly from an oscilloscope?
No, it must be calculated
What is the formula to convert peak voltage to r.m.s. voltage?
Vrms = Vpeak / √2
What is the formula to convert r.m.s. voltage to peak voltage?
Vpeak = Vrms × √2
What is the relationship between peak current and r.m.s. current?
Irms = Ipeak / √2
What type of meters measure r.m.s. voltage?
Digital multimeters or moving coil meters
What is the significance of Vrms in comparison to a DC supply?
Vrms delivers the same energy as the DC source (Vrms ≈ Vdc)
What is always true about the relationship between Vpeak and Vrms?
Vpeak will always be a larger value than its equivalent Vrms
