Before revision: This is described as the width of a bus which is the number of bits the bus can transfer per clock cycle and can be synonymous with the number of physical electrical conductors the bus has given each conductor transfers one bit at a time.
After revision: This is described as the width of a bus which is the number of bits the bus can transfer per clock cycle and can be synonymous with the number of physical electrical conductors the bus has given each conductor transfers one bit at a