Mention two disadvantages of using animal dung directly as a fuel.

The energy liberated by burning $1 \,g$ of charcoal is approximately: (in $,kJ$)

Ranvir lives in a village and uses wood as a fuel. He studied in his school that charcoal is a better fuel than wood. He decided to use charcoal instead of wood.
$(a)$ How can Ranvir obtain charcoal from wood?
$(b)$ Why is charcoal considered a better fuel than wood? (Give two reasons)

Enlist four simple choices which can make a difference in our energy consumption patterns.

What constitutes a source of energy?

Why are we looking at alternate sources of energy?