GEOLOGY

Detailed explanation-1: -A bulb connected by two cells in parallel is equally bright as when connected to one cell. In both cases the voltage is 1.5 V. Two cells in parallel will last twice as long as a single cell. Two cells in series produce a brighter bulb, but will last as long as a single cell.

Detailed explanation-2: -Two batteries in series makes the bulb use four times as much power as one! Doubling the voltage in this arrangement both doubles the voltage drop across the resistor and the current through it. The bulb will be much brighter.

Detailed explanation-3: -More chemical energy is converted to electrical energy when two cells are used. Consequently, the flow of electric current is greater.

Detailed explanation-4: -Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit. Another advantage to the parallel circuit is that if one loop is disconnected, then the other remains powered.

Detailed explanation-5: -How the volume of a buzzer/ brightness of a bulb is affected by the number and voltage of cells used. Adding more batteries increases voltage, therefore making bulbs brighter, buzzers louder and motors move faster.