Symbols of Electronic Components

Two or more cells are connected together to form a _____.

In an open circuit, the electric component that remains open is 

Can you think of any four devices which can work even when not connected to the switchboards at your home?

Name the instrument that measures current flowing in a circuit.

 Electric current has _____ energy. (Choose from: electrical/ chemical/ mechanical)

What you mean by load in an electric circuit?

Write the names of three domestic devices. How are these connected with mains?

 is a symbol of 

Write the symbols used for switch on and off position.

When the _____ through the fuse exceeds a certain limit, the fuse wire melts and breaks.

If one coulomb of charge is flowing in one minute, it is called ‘ampere’.

A fuse wire is an alloy of lead and _____ (tin/iron).

Why does the battery of a vehicle get discharged if not in use for a long period of time?

Name the instrument used for measuring voltage.

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?

Current flows only if the circuit is open.