Potential Difference and EMF
Potential Difference and EMF: Overview
This topic characterizes the direction of the electric field with diagrams. Moreover, it explains the difference between the potential difference and EMF. The Ohm's law and its limitations are also discussed here.
Important Questions on Potential Difference and EMF
Give the name of electrode to which anions migrate during electrolysis.
Anions are negative ions and they _____.
Which of the following will produce an anion?
Atoms carrying negative charge are called _____.
Select the correct statement about emf.
Both potential difference and emf has the S.I. unit _____.
Potential difference is always greater than emf.
To make a battery of two cells, the negative terminal of one cell is connected to the positive terminal of the other cell.
Draw the symbol of the battery. Also mention its function.
Explain the reason for constant potential difference between the terminals of a battery.
When the battery of a vehicle is not used for a long time, it gets discharged due to a phenomenon called _____.
Mention the factor that maintains the flow of charge through a conductor.
(List: Resistance, Voltmeter, Ammeter, Current, potential difference)
Why does the battery of a vehicle get discharged if not in use for a long period of time?
Define electric potential and potential difference.
Read the passage and answer the questions given below.
Energy exists in the form of electricity in nature. There are many misconceptions regarding who discovered it. Many people credit Benjamin Franklin with the discovery of electricity. In reality, his experiments just proved that there exists a connection between electricity and lightning.
Static electricity was thought to have been discovered by Ancient Greeks in about , by rubbing fur on amber. English physician William Gilbert used the Latin term 'electricus' to describe the force of attraction exhibited by certain substances when rubbed together. Thomas Brown, another English scientist, used the word 'electricity' to describe his investigations based on Gilbert's work.
In , Benjamin Franklin performed his experiment of flying a kite with a metal key in the presence of a storm. He conclusively proved that lightning and the tiny electric sparks were one and the same thing. In , Italian physicist, Alessandro Volta constructed the voltaic pile, an early electric battery using chemical reactions producing electricity.
Answer the following question based on the passage.
Who used chemical reactions to produce a battery?
