average current calculator
Calculate average current for DC, sine, rectified, and PWM waveforms using the integral over one period or quick closed-form formulas for common cases.
rectified current average
Average current is the average of current with time: divide the integral of one cycle by the period. In PWM, just times the peak current by the duty cycle.
Formula & Table Summary:
\( I_{\text{avg}}=\frac{1}{T}\int_{0}^{T} i(t)\,dt \)
\( I_{\text{avg,FW\ rect}}=\frac{2}{\pi} I_{\text{peak}},\quad I_{\text{avg,HW\ rect}}=\frac{1}{\pi} I_{\text{peak}} \)
\( I_{\text{avg,PWM}}=D\,I_{\text{on}} \)
half-wave average current
Compute average current in DC, sine, rectified and PWM. Integrate over one period, or use closed-form expressions such as (2/pi) Ipeak (in full-wave) or DIon (in PWM).In PWM or rectangular pulse, average current is the duty factor times the peak (or on) current. When used with RMS analysis, knowing average current can be used to estimate DC delivery to loads, converter outputs, battery charge and/or discharge rates, and thermal or fuse sizes. Simply enter a voltage/ resistance or a waveform parameter and compute average current in a flash with DC, AC, rectified, and PWM conditions.
full-wave average current
| Waveform | Parameters | Iavg (A) |
|---|---|---|
| DC constant | I = 5 A | 5.00 |
| Sine (full cycle) | Ipeak = 10 A | 0.00 |
| Full-wave rectified | Ipeak = 10 A | 6.37 |
| Half-wave rectified | Ipeak = 10 A | 3.18 |
| PWM rectangular | D = 0.25, Ion = 4 A | 1.00 |
| PWM rectangular | D = 0.60, Ion = 2 A | 1.20 |
Frequently Asked Questions - average current calculator:
What is average current?
The mean value of current over time, typically over one period for periodic waveforms.
How do I compute average current in general?
Integrate i(t) over one period and divide by the period: Iavg=(1/T)∫0^T i(t) dt.
What is the average of a sine current?
Over a full cycle it is zero.
What is the average of a full-wave rectified sine?
Iavg = (2/π)·Ipeak.
What is the average of a half-wave rectified sine?
Iavg = (1/π)·Ipeak.
How to get average current for PWM?
Multiply duty cycle by the on-state current: Iavg = D·Ion.
Does average current equal RMS?
No. RMS measures heating effect; average measures mean value.
Can I use voltage and resistance?
For DC, Iavg = V/R. For PWM to a resistor, Ion ≈ V/R during on-time.
Why is average important?
It indicates net DC delivery, battery charge/discharge, and converter outputs.
When is average zero but RMS non-zero?
In pure AC (sine) with no DC offset.
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