What are these?
These are batteries.
What's this?
It's a battery holder.
What's this?
It's a lamp.
Does this circuit work?
Yes, it does.
Does this circuit work?
No, it doesn't.
What are these?
These are cables (wires)
Does it need electricity?
No, it doesn't.
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.
