(1) The value of the current depends upon how they are connected.
When placed in series:
The resistance would be: 3+2=5ohms.
Ohm's law is given as:
[tex]I=\frac{V}{R}[/tex]
⇒[tex]I=\frac{1.5}{5}=3 ampere[/tex]
When placed in parallel:
The resistance would be: [tex]\frac{3{\times}2}{3+2}=1.2 ohms[/tex]
Now, the current would be:
[tex]I=\frac{1.5}{1.2}=1.25 ampere[/tex]
(2) The purpose of a fuse or circuit breaker is to stop current that is flowing too fast.
A fuse is wire that have low melting point when placed in a circuit. When current is moving too fast i.e. in case of over current, the heat produced melts this wire which further breaks the circuit. Similarly a circuit breaker is a switch which opens up in case of over flow of current.
Thus, a circuit breaker is then used to to stop current that is flowing too fast.
