In a household electric circuit different appliances are connected in parallel to one another. Give two reasons for this. An electrician puts a fuse of rating $5 \,A$ in that part of domestic electrical circuit in which an electrical heater of rating $1.5\, kW , 220 \,V$ is operating. What is likely to happen in this case and why ? What change, if any, needs to be made ?
In a household electric circuit different appliances are connected in parallel to one another. Give two reasons for this. An electrician puts a fuse of rating $5 \,A$ in that part of domestic electrical circuit in which an electrical heater of rating $1.5\, kW , 220 \,V$ is operating. What is likely to happen in this case and why ? What change, if any, needs to be made ?
$(a)$ Reasons
$(i)$ Each appliance will be at the same potential i.e., voltage.
$(ii)$ If one of the appliances fail, the others will still keep working. Rating of fuse $5 A$
$V =220 V , P =1.5 kW =1500 W$
Current in the circuit $I=\frac{P}{V}=\frac{1500}{220}=6.8 A$
The current in the circuit is more than the rating of the fuse. Therefore, the fuse will blow off. A fuse of rating of about $10\, A$ should be put in the circuit.
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