Two things that must be in circuits to make them work are a conductor and a voltage source.
<u>Explanation:</u>
There are tow main parts that helps all electric circuits to work. They are a conductor and a voltage source. Some of the other parts of circuits includes,switches and bulbs.The working of an electrical circuit is same as that of the human circulatory system.The blood is taken to all parts of human body with the help of the blood vessels in a circulatory system.
Same thing happens with an electrical circuit. This is responsible in taking current to all parts of an electrical system. In an electrical circuit electricity will flow from the voltage of high to low. A path should be there for conducting the electric power.