Electric Circuit

What are electric switches?

Point out the differences between EMF and potential difference.

Explain the analogy of the electric current with water flow.

What are the differences between a series and parallel connection?

Define emf of a battery.

Electricity is used in driving some machines.

Explain the usage of electricity in driving machines.

This converts electrical energy into light energy. (Electric bulb/Electric fan)

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 $600 \mathrm{BC}$, 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 $1752$, 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 $1800$, 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?

Electric bulb converts

Draw the symbol for cell, open and closed circuits, battery and bulb.

Complete the drawing shown in the figure given alongside to indicate where the free ends of the two wires should be joined to make the bulb glow.