Frequency & Period

• the period (T) is measured in seconds (s)
• frequency (f) is measured in hertz (Hz)
• one is cycles per second while the other is seconds per cycle
• 1T = 1 Cycle takes 1 second to complete
• 1Hz = 1 cycle per second
• 2T = 1 cycle takes 2 seconds to complete
• 2Hz = 2 cycles per second
• 10T = 1 cycle takes 10 seconds to complete
• 10Hz = 10 cycles per second
• 0.002T = 1 cycle takes 2 Milliseconds to complete
• 5GHz = 5 billion cycles per second (Wi-Fi)

If an AC voltage has a frequency of 1200 Hz, how long (in time) is its period?

1/1200 = 0.00083333333

= 0.83.... milliseconds or 833μs (microseconds) to complete one cycle

For sine wave waveforms only, we can also express the periodic time of the waveform in either degrees or radians, as one full cycle is equal to 360o ( T = 360o ) or in Radians as 2pi, 2π ( T = 2π ), then we can say that 2π radians = 360o 

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Hi, I'm Hamed, an Electrical & Electronics Engineering Student in Leeds, UK. At the time of recording this video I am in my second year at university.

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