BRIEFING (ELECTRICITY)

Sources of electricity

Dry cells

Dynamos

 Accumulators

 Solar cells

Rechargeable batteries 

Two types of circuits

 Series circuit

When the number of bulbs increases, the brightness of each bulb decreases. 

If any part of the circuit is broken, all bulbs do not light up.

 Parallel circuit

The number of bulb does not affect the brightness of each bulb. 

If one of the circuits is broken, the bulb in the other circuit still lights up.