For sure starts in cold weather, a truck has a 500 FF capacitor alongside a battery. The capacitor is charged to the full 13.8 VV of the truck's battery. What is the ratio between the energy density per unit mass of the 9.0 kgkg capacitor system and the 130,000 J/kgJ/kg of the truck's battery.

A 1.8 µF capacitor and a 3.9 µF capacitor are connected in parallel across a 240 V potential difference. Calculate the total energy in joules stored in the capacitors.

The dielectric constant of a solid is 2000. It is placed between the plates of a capacitor that are 1 μm apart and with an applied voltage of 0.10 V. Calculate the capacitance per square millimetre of this device and the local electric field acting on an atom in the dielectric.

Batteries and capacitors can be used to store electrical energy. Batteries do this in the form of chemical potential energy whereas capacitors do this with an electric field. Batteries tend to be more stable but capacitors tend to have faster charge and recharge times. A simple capacitor can be constructed from two conductive plates. Two conductive plates with an area of 10.0cm x 10.0 cm are held facing one another at a separation of 1.50 mm and 12.0 V is applied between them. a) Find the capacitance of this configuration b) Find the charge on the plates. c) How much energy is stored in the capacitor? d) How much energy can the capacitor store if a dielectric with K= 4.5 is inserted between the plates rather than air?

A parallel plate capacitor is made from two aluminum foil sheets, each 3.8cm wide and 6.1 m long. Between the sheets is a Teflon strip of the same width and length that is 0.025mm thick. What is the energy stored in the capacitor when the charge on the capacitor is 30 uC?

The electric potential energy stored in the capacitor of a defibrillator is 100 J, and the capacitance is 110 μF. What is the potential difference across the capacitor plates?

A capacitor of unknown capacitance is connected across a battery of V volts. The charge stored in it is 300 µC. When potential across the capacitor is reduced by 100 V, the charge stored in it becomes 100 V. Calculate the potential V and the unknown capacitance. What will be the charge stored in the capacitor if the voltage applied had increased by 100 V?

A capacitor with capacitance C is connected to a power supply that maintains the voltage at some value Vo. This stores an energy of Uo in the capacitor. What is the energy Uo in terms of C and Vo? How much energy would be stored in the capacitor if the voltage were raised to 3Vo? Give your answer in terms of Uo.

An electronic flash unit for a camera contains a capacitor with a capacitance of 940 µF. When the unit is fully charged and ready for operation the potential difference between the capacitor plates is 430 V. What is the magnitude of the charge on each plate of the fully charged capacitor?  Group of answer choices 0.140 C 2.57 C 10.1 C  0.404 C

A 4.5 nF (4.5 x 10-9 F) parallel-plate capacitor is charged to a 175 V battery. It is then disconnected from the battery and immersed in distilled water. Distilled water has a dielectric constant of (k = 80).  What is the energy of the capacitor after its immersion in water?