The balance sheet follows the double entry concept. The reasoning behind this concept is that for an organisation to have economic resources there must be claims to those resources (capital) and or obligations (liabilities) created in their acquisition. This is the basis of the accounting equation:
Assets (economic resources) = Capital + Liabilities
As explained above, this equation will always be followed and thus the concept of the 'balance sheet'. For instance, an increase in the value of assets held cannot occur without a corresponding increase in claims to those assets either from the owners (capital) or financiers (liabilities).
Assets are further classified according to their maturity profiles. Those that are likely to be converted into cash within 12 months are termed as
current assets. The other class of assets is referred to as
noncurrent and will include motor vehicles and equipments such as fridges and cookers.
Owners' claims to assets could either refer to the amounts injected by the owners into the business (share capital) or the excess resources generated by the entity in the past and reinvested in the business (revenue reserves).
Just like assets, liabilities are also classified into two broad categories, short term and long term depending on their age profiles. They are short term where financial obligations are likely to be settled within the next 12 months such as in the case of amounts owed to suppliers (trade payables), short term loans from say banks...