The graph of Figure shows how $V$ Depends on $Q$ for a particular capacitor.

The energy stored by a capacitor is equal to the area under the graph of voltage against charge.

The area under the graph has been divided into strips to make it easy to calculate the energy stored. The first strip (which is simply a triangle) shows the energy stored when the capacitor is charged up to $10\mathrm{V}$. The energy stored is $\frac{1}{2}\mathrm{QV}=\frac{1}{2}\times 1.0 \mathrm{mC}\times 1.0 \mathrm{V}=0.5 \mathrm{mJ}$Copy the table given below and complete it by calculating the areas of successive strips, to show how $W$ depends on $V$.

The graph of Figure shows how $V$ depends on $Q$ for a particular capacitor.

The energy stored by a capacitor is equal to the area under the graph of voltage against charge.

The area under the graph has been divided into strips to make it easy to calculate the energy stored. The first strip (which is simply a triangle) shows the energy stored when the capacitor is charged up to $10\mathrm{V}$. The energy stored is $\frac{1}{2}\mathrm{QV}=\frac{1}{2}\times 1.0 \mathrm{mC}\times 1.0 \mathrm{V}=0.5 \mathrm{mJ}$. Plot a graph of W against V. Describe the shape of this graph.

Calculate the energy stored in the capacitor of capacitance $5000\mu \mathrm{F}$ which is charged to $5.0 \mathrm{V}$.

Calculate the energy stored in the capacitor of capacitance $5000\mathrm{pF}$ which is charged to $5.0 \mathrm{V}$.

Calculate the energy stored in the capacitor of capacitance $200 \mu \mathrm{F}$ which is charged to $230 \mathrm{V}$.

A $10000\mu \mathrm{F}$ capacitor is charged to $12 \mathrm{V}$, and then connected across a lamp rated at $12\mathrm{V},36\mathrm{W}$. Calculate the energy stored by the capacitor.

A $10000\mu \mathrm{F}$ Capacitor is charged to $12 \mathrm{V}$, and then connected across a lamp rated at $12\mathrm{V},36\mathrm{W}$. Estimate the time the lamp stays fully lit. Assume that energy is dissipated in the lamp at a steady rate.

In a simple photographic flashgun, a $0.20 \mathrm{F}$ capacitor is charged by a $9.0 \mathrm{V}$ battery. Calculate the charge on and energy stored by the capacitor.