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Calculate Battery Capacity
Calculating the capacity of a battery from voltage and energy. The capacity of a battery indicates its size, i.e. how much power it can deliver before it runs out. Work is a form of energy, the capacity can also be referred to as electrical charge.
energy = capacity * voltage or work = charge * voltage
E = C * U or W = Q * U
Please enter two values, the third value will be calculated.
1 Wh = 3.6 kJ. 1 mAh = 3.6 C. 1Ah = 1000 mAh. The SI-units are kilojoules and coulombs.
Examples: with a capacity of 36000 milliampere hours and a voltage of 5 volts, the energy is 180 watt hours. These are the values of a relatively large power bank.
An electric car with an energy of 60 kilowatt hours, i.e. 60000 watt hours, has at a voltage of 400 volts a capacity of 150000 milliampere hours, i.e. 150 ampere hours.
Capacitance (Capacitor)
The capacitance is the ability to store electrical charge. This is stored in an capacitor. Its unit is farad, which is calculated as coulomb divided by volt, F=C/V.
Please enter two values, the third value will be calculated.
Examples: with a voltage of 200 volts and a charge of one coulomb, the electrical capacitance is 0.005 farads, which is 5 millifarads or 5000 microfarads. These are just example values to clarify the calculation. Capacitors play a major role in microelectronics, where the charge is usually lower and capacitances of less than one microfarad are common. If volts are left without a prefix (such as milli- or micro-) and coulombs have such a prefix, then the same prefix is used for farads. So with a voltage of 5 volts and an electrical capacitance of 2 microfarads, the capacitor has a charge of 10 microcoulombs.
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