Every cell has a positive terminal (protruding metal cap) and a negative terminal (flat metal disc).
Two or more cells joined, positive to negative — powers a circuit longer, or delivers more energy.
A thin filament heats up and glows. Either terminal can connect to either end of the cell.
No filament — the longer wire is positive, the shorter negative. Current flows only one way.
The lamp glows only when both cell terminals connect through it, forming a circuit.
Two drawing pins, a safety pin, and cardboard are enough to build one.
Let current flow easily — mostly metals, like copper (cheap, abundant, used for wires).
Block current — plastic, rubber, ceramics. Wires are covered in these to protect us.
Comes from cells and batteries, typically powering small devices.
Comes from wall sockets and power plants, able to run larger appliances.
A source of electrical energy with + and − terminals.
Two or more cells connected together.
The thin wire that glows in an incandescent lamp.
A lamp that lets current flow in only one direction.
A complete path for current to flow.
A circuit shown using standard symbols.
Lets current through easily / blocks it.
Direct current (cells) / alternating current (mains).