RC discharging calculator
Online calculator for formulas used in electronic circuit design and electrical engineering.Basic electric calculations:
Ohm's Law,
Ohm's Law with power,
DC power,
AC real power,
LC resonant frequency,
Capacitor charging/discharging,
Capacitive reactance,
Capacitive current + reactive power,
Capacitor energy,
Capacitor Δ energy,
RC discharging,
Inductor square pulse,
Inductive reactance,
Inductive current + reactive power,
Inductor energy,
2 parallel resistors,
3 parallel resistors
Wire and winding calculations:
Calculate RC discharging: 1000uF, 3kΩ, 5s, 12V, V
A capacitor C discharging via a resistor R for time t. Voltage 1 (V1) is the initial voltage. Voltage 2 (V2) is the final voltage. C=t/(R.log(V1/V2)) R=t/(C.log(V1/V2)) t=R.C.log(V1/V2) V1=V2*et/(RC) V2=V1/et/(RC)
Enter any 4 values, the 5th one will be calculated:
Standard EIA Decade Values of capacitors - decade 1 to 10 mF
| E6 | E12 | E24 |
|---|---|---|
| 1.0 mF 1.5 mF 2.2 mF 3.3 mF 4.7 mF 6.8 mF | 1.0 mF, 1.2 mF 1.5 mF, 1.8 mF 2.2 mF, 2.7 mF 3.3 mF, 3.9 mF 4.7 mF, 5.6 mF 6.8 mF, 8.2 mF | 1.0 mF, 1.1 mF, 1.2 mF, 1.3 mF 1.5 mF, 1.6 mF, 1.8 mF, 2.0 mF 2.2 mF, 2.4 mF, 2.7 mF, 3.0 mF 3.3 mF, 3.6 mF, 3.9 mF, 4.3 mF 4.7 mF, 5.1 mF, 5.6 mF, 6.2 mF 6.8 mF, 7.5 mF, 8.2 mF, 9.1 mF |
Other capacitance decades:
1 - 10 pF, 10 - 100 pF, 100 - 1000 pF, 1 - 10 nF, 10 - 100 nF, 100 - 1000 nF, 1 - 10 uF, 10 - 100 uF, 100 - 1000 uF, 1 - 10 mF, 10 - 100 mF, 100 - 1000 mF, 1 - 10 F, 10 - 100 F, 100 - 1000 F, 1 - 10 kF, 10 - 100 kF, 100 - 1000 kF,Standard EIA Decade Values of resistors - decade 1 to 10 kΩ
| E6 | E12 | E24 |
|---|---|---|
| 1.0 kΩ 1.5 kΩ 2.2 kΩ 3.3 kΩ 4.7 kΩ 6.8 kΩ | 1.0 kΩ, 1.2 kΩ 1.5 kΩ, 1.8 kΩ 2.2 kΩ, 2.7 kΩ 3.3 kΩ, 3.9 kΩ 4.7 kΩ, 5.6 kΩ 6.8 kΩ, 8.2 kΩ | 1.0 kΩ, 1.1 kΩ, 1.2 kΩ, 1.3 kΩ 1.5 kΩ, 1.6 kΩ, 1.8 kΩ, 2.0 kΩ 2.2 kΩ, 2.4 kΩ, 2.7 kΩ, 3.0 kΩ 3.3 kΩ, 3.6 kΩ, 3.9 kΩ, 4.3 kΩ 4.7 kΩ, 5.1 kΩ, 5.6 kΩ, 6.2 kΩ 6.8 kΩ, 7.5 kΩ, 8.2 kΩ, 9.1 kΩ |
Other resistance decades:
10 - 100 mΩ, 100 - 1000 mΩ, 1 - 10 Ω, 10 - 100 Ω, 100 - 1000 Ω, 1 - 10 kΩ, 10 - 100 kΩ, 100 - 1000 kΩ, 1 - 10 MΩ, 10 - 100 MΩ, 100 - 1000 MΩ,Some common voltages:
| Alkaline Zinc-Carbon |
NiMH, NiCd rechargeable |
Li-Ion 3.6V |
Li-Ion 3.7V |
Li-Ion full 4.2V |
LiFePO4 (LFP) 3.2V |
Lead-acid battery |
Power supply |
|---|---|---|---|---|---|---|---|
|
1-cell: 1.5V 2-cell: 3V 3-cell: 4.5V 4-cell: 6V 5-cell: 7.5V 6-cell: 9V 7-cell: 10.5V 8-cell: 12V 9-cell: 13.5V 10-cell: 15V 11-cell: 16.5V 12-cell: 18V |
1-cell: 1.2V 2-cell: 2.4V 3-cell: 3.6V 4-cell: 4.8V 5-cell: 6V 6-cell: 7.2V 7-cell: 8.4V 8-cell: 9.6V 9-cell: 10.8V 10-cell: 12V 11-cell: 13.2V 12-cell: 14.4V |
1-cell: 3.6V 2-cell: 7.2V 3-cell: 10.8V 4-cell: 14.4V 5-cell: 18V 6-cell: 21.6V 7-cell: 25.2V 8-cell: 28.8V 9-cell: 32.4V 10-cell: 36V 11-cell: 39.6V 12-cell: 43.2V |
1-cell: 3.7V 2-cell: 7.4V 3-cell: 11.1V 4-cell: 14.8V 5-cell: 18.5V 6-cell: 22.2V 7-cell: 25.9V 8-cell: 29.6V 9-cell: 33.3V 10-cell: 37V 11-cell: 40.7V 12-cell: 44.4V |
1-cell: 4.2V 2-cell: 8.4V 3-cell: 12.6V 4-cell: 16.8V 5-cell: 21V 6-cell: 25.2V 7-cell: 29.4V 8-cell: 33.6V 9-cell: 37.8V 10-cell: 42V 11-cell: 46.2V 12-cell: 50.4V |
1-cell: 3.2V 2-cell: 6.4V 3-cell: 9.6V 4-cell: 12.8V 5-cell: 16V 6-cell: 19.2V 7-cell: 22.4V 8-cell: 25.6V 9-cell: 28.8V 10-cell: 32V 11-cell: 35.2V 12-cell: 38.4V |
1-cell: 6V 2-cell: 12V 3-cell: 18V 4-cell: 24V 5-cell: 30V 6-cell: 36V 7-cell: 42V 8-cell: 48V 9-cell: 54V 10-cell: 60V 11-cell: 66V 12-cell: 72V |
1.8V 2.5V 3V 3.3V 5V 6V 9V 12V 15V 18V 24V 48V |
RC discharging formula says:
•A 1000uF (one thousand microfarads) capacitor discharges via a 3kΩ (three kiloohms) resistor during 5s (five seconds) from 12V (twelve volts) to 2.266507234051V (two point two six six five zero seven two three four zero five one volts).•To discharge a 1000uF (one thousand microfarads) cap from 12V (twelve volts) to 2.266507234051V (two point two six six five zero seven two three four zero five one volts) in 5s (five seconds), you need a 3kΩ (three kiloohms) discharging resistor.
•Discharging a 1000uF (one thousand microfarads) capacitor from 12V (twelve volts) to 2.266507234051V (two point two six six five zero seven two three four zero five one volts) using a 3kΩ (three kiloohms) resistance will take 5s (five seconds).
•If a capacitor should discharge from 12V (twelve volts) to 2.266507234051V (two point two six six five zero seven two three four zero five one volts) via 3kΩ (three kiloohms) in 5s (five seconds), its capacitance would have to be 1000uF (one thousand microfarads).
This is a simple online calculator for formulas used in electronic engineering and design.
This online calculator is for reference only. I do not guarantee it to work correctly. You use this at your own risk only.