# What is Form factor? – Form factor Formula

Form factor is defined as the ratio of RMS value to the average value of a waveform. The waveform can be quantity like voltage, current, etc. This parameter is generally used in the rectifiers.

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## Form factor Formula where,

Arms is the rms value of the waveform

Aavg is the average value of the waveform

### Form factor of Half wave rectifier

The RMS value of output current of single-phase half-wave rectifier is given by where, Im is the peak value of output current.

The average value of output current of single-phase half-wave rectifier is given by where, Im is the peak value of output current.

As we know that form factor is given by Therefore, we get ∴ Form factor = π/2 = 1.5707963

The form factor of half wave rectifier is 1.5707963

### Form factor of Full wave rectifier

The RMS value of output current of single-phase full-wave rectifier is given by where, Im is the peak value of output current.

The average value of output current of single-phase full-wave rectifier is given by where, Im is the peak value of output current.

As we know that form factor is given by Therefore, we get ∴ Form factor = 1.11072073

The form factor of full wave rectifier is 1.11072073

### Form factor of Bridge rectifier

The RMS value of output current of Bridge rectifier is given by where, Im is the peak value of output current.

The average value of output current of Bridge rectifier is given by where, Im is the peak value of output current.

As we know that form factor is given by Therefore, we get ∴ Form factor = 1.11072073

The form factor of bridge rectifier is 1.11072073

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