Answer the following.
1.Draw a simple circuit diagram using symbols of electrical components.
2.The handles of the tools like screw drivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Why?
3.Why is an electric fuse required in all electrical appliances?
4.Why tungsten is used asfilament in a bulb?
Answers
Answer:
2-The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why? Answer: Rubber or Plastics are insulators i.e. they don't allow current to pass through them.
Explanation:
4-Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).
3-fuse(s) is needed in any electrical system (AC or DC). These protection devices react to the amount of heat being produced by electricity passing through wires and/or components. They are used so as to protect wires and components from the extreme heat produced should there be an electrical overload or short circuit.
