if they're not then the circuit will not work and it won't be able to power wat u want it to power for example a lightbulb.it will be an open circuit
They can, but not required.
To carry elections
Advantages in electric circuits : Advantages of using the rheostat in electric circuits is optional as you could just use the dial on the power-supply to vary the voltage (p.d.), and therefore the current. The advantage of using the rheostat is that you can control it to give you nice even numbers for the voltage.
shock risk
series
Open circuits and closed circuits both allow the movement of electric energy. In an open circuit, electric energy cannot flow because the circuit is incomplete. In a closed circuit, electric energy can flow because the circuit is complete and forms a continuous pathway for the energy to move.
Colin D. Simpson has written: 'Principles of DC/AC circuits' -- subject(s): Electronic circuits 'Introduction to Electric Circuits and Machines' -- subject(s): Electric circuit analysis, Electric circuits, Electric machinery 'Industrial electronics' -- subject(s): Industrial electronics
In electrical circuits, the flow of electric current is common.
J. Richard Johnson has written: 'Electric circuits' -- subject(s): Electric circuits
Edward Nicholas Pink has written: 'The electric and magnetic circuits' -- subject(s): Electric circuits, Electric currents, Magnetism
Battery
Sadly no...
They can, but not required.
yes
Roland E. Thomas has written: 'The analysis and design of linear circuits' -- subject(s): Linear Electric circuits, Electric circuit analysis, TECHNOLOGY & ENGINEERING / Electronics / Circuits / General, Design and construction 'Solutions manual to accompany Circuits and Signals' 'Circuits and signals' -- subject(s): Interface circuits, Linear integrated circuits
Impressionist paintings are a non-example of electric circuits.
no