Does this circuit work?
No, it doesn't.
What's this?
It's a lamp.
Does it need electricity?
No, it doesn't.
What's this?
It's a battery holder.
What are these?
These are cables (wires)
What are these?
These are batteries.
Does this circuit work?
Yes, it does.
What's this?
It's a switch.
Does it need cells or mains?
mains.
When our hands are wet? Can we touch something electrical?
No, we can't.
Does it use cells or mains?
cells.