The unit of capacitance is the (F). From the above formula: 1 farad = 1 coulomb per volt. The farad is too large a unit for practical purposes and the following submultiples are used: 1 mF (microfarad) = 1 × 10–6 F and 1 nF (nanofarad) = 1 × 10–9 F Note: When a capacitor is charging, the current is not constant (more on this later). This means the formula Q = It cannot be used to work out the charge stored. Example: A capacitor stores 4 × 10–4 C of charge when the potential difference across it is 100 V. Calculate the capacitance. Q = 4 x 10-4 C V = 100 V F = 4 μF C = ? Energy stored in a capacitor A charged capacitor stores electrical energy. Consider the charging of a parallel capacitor as shown below:
The unit of capacitance is the (F). From the above formula: 1 farad = 1 coulomb per volt. The farad is too large a unit for practical purposes and the following submultiples are used: 1 mF (microfarad) = 1 × 10–6 F and 1 nF (nanofarad) = 1 × 10–9 F Note: When a capacitor is charging, the current is not constant (more on this later). This means the formula Q = It cannot be used to work out the charge stored. Example: A capacitor stores 4 × 10–4 C of charge when the potential difference across it is 100 V. Calculate the capacitance. Q = 4 x 10-4 C V = 100 V F = 4 μF C = ? Energy stored in a capacitor A charged capacitor stores electrical energy. Consider the charging of a parallel capacitor as shown below:
sasbhs_science_physics_highers_12_3051020589.docx