Electricity and Magnetic Effect Practice set Q. 1. Define the SI unit of potential difference. Ans. If amount of work done in bringing a one coulomb charge from one point to the other is 1 joule then potential difference between two points is said to be 1 volt. Q. 2. Name the device that helps to maintain a potential difference across a conductor. Ans. A battery is used to maintain potential difference across a conductor. Q. 3. Name the physical quantity which is same in all the resistors when they are connected in series. Ans. Electric current. Q. 4. State the relationship between 1 ampere and 1 coulomb. Ans. 1 ampere = 1 coulomb/1 second Q. 5. State in brief the meaning of an electric circuit. Ans. A closed conducting path through which electric charge may flow. Q. 6. Name the physical quantity whose unit is volt/ ampere. Ans. Resistance. Q. 7. Through which of the two wire