Understanding Voltage Across C2
This calculator estimates the voltage across C2 in common capacitor circuits. It supports series, parallel, and mixed arrangements. It also reports charge, energy, reactance, and current. These values help when checking filters, timing stages, coupling networks, and lab problems.
Why Capacitance Changes Voltage
Capacitors divide voltage differently from resistors. In a series chain, the smaller capacitance usually takes the larger voltage. That happens because every series capacitor stores the same charge. Voltage then equals charge divided by capacitance. In a parallel branch, each capacitor has the same voltage as the supply.
Advanced Inputs
The tool accepts capacitance in pF, nF, uF, mF, or F. It converts every value to farads before solving. For AC inputs, it uses frequency to calculate capacitive reactance. It also estimates ideal RMS current through C2. For DC inputs, steady current is shown as zero. The stored energy value still uses the selected voltage.
Tolerance and Real Parts
The tolerance field gives a practical range. It recalculates the result using low and high C2 values. This is useful because real capacitors vary. A marked 10 uF part may not be exactly 10 uF. Tolerance, aging, temperature, and voltage bias can shift the actual value.
Using the Result
Use the topology field first. Then enter the supply voltage and capacitance values. Enter C3 only when the selected circuit needs it. Choose the unit that matches your parts. Add frequency when the supply is AC. Press calculate to see the result above the form.
Reports and Safety
The CSV export creates a compact spreadsheet row. The PDF export creates a simple report. Both are useful for notes, estimates, and client records. The example table shows typical inputs and expected output. Always compare the result with the actual circuit drawing. Real circuits may include leakage, load resistance, dielectric loss, and startup transients. For safety work, confirm ratings with a qualified electrical professional.
Design Margin
For advanced checking, compare nominal voltage with the tolerance range. If the high value approaches the capacitor rating, select a higher rated part. Many designers keep extra voltage margin. That margin reduces heat stress and improves life. The calculated current is ideal. It does not include ESR heating. Use manufacturer data when power loss matters. The result is an estimate, not a substitute for testing. Record assumptions before sharing any final design file.