Ns-Term 3 - Unit 2: Cells Flashcards
1
Q
what are cells a source of
A
electrical energy
2
Q
what is a battery?
A
two or more cells connected in series
3
Q
define electrolytes
A
solution that can conduct electricity
4
Q
what happens when a circuit is closed?
A
A chemical reaction takes place and chemical energy is converted into electrical energy
5
Q
how is current conducted?
A
- in the electrolyte, there are 2 different types of metals, e.g. zinc and copper
- 2 metals make + and - poles of the cells (known as electrodes)
- when connected to an external circuit, + ions are attracted to - pole and - ions attracted to + pole
- there is a potential difference between poles
- energy is transferred to charges in external circuit
6
Q
how are cells connected in series
A
positive pole of one cell is connected to negative pole of the other cell
7
Q
how are cells connected in parallel?
A
all negative pole are connected to one end and all positive poles to the other end
8
Q
what does a cell consist of?
A
- an electrolyte
- metal pieces that serve as poles/electrodes
