Advertisements
Advertisements
Question
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
Advertisements
Solution
`P = 5 xx 10^3 W`
V = 200
`:. P = IV`
`5 xx 10^3 = I[200]`
`5000/200 = I`
I = 25 A
25 A > 8 A
Yes it can be used ∵ current is greater than 8A
APPEARS IN
RELATED QUESTIONS
For a fuse, higher the current rating ________ is the fuse wire.
A fuse is connected in ______ with the ______ wire.
Describe with the aid of a diagram some form of a fuse which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.
Two fuse wire of same length are rated 5 A and 20 A. Which of the two is thicker?
Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.
The rating of a fuse connected in the lighting circuit is ______.
What is the rating of fuse used in power circuits, in domestic use?
(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.
State the purpose of using a fuse in a circuit.
Name two safety devices which are connected to the live wire of a household electric circuit.
