Advertisements
Advertisements
Question
‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?
Advertisements
Solution
The safe limit of current which can flow through the electrical appliance is I = P/V = 5000/200
= 25 A; which is greater than 8 A. So, such fuse cannot be used.
RELATED QUESTIONS
Explain the meaning of the student 'current rating of a fuse is 5A'.
What is a fuse?
(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have ?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance ?
What is the rating of fuse used in power circuits, in domestic use?
Explain the significance of kWh meter, main switch and main fuse in house-circuiting.
(a) Name the electrical appliance shown in the diagram below.
(b) Name the material of the wire used in this device.
(c) Name two important characteristics of this wire.
Name the material of fuse. State one characteristic of the material used for fuse.
Two fuse wires are rated 5 A and 20 A. Which of the two is longer ?
Name two safety devices which are connected to the live wire of a household electric circuit.
Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit?
