Advertisements
Advertisements
Question
Out of the three fuses with current ratings 5A, 10A, 15A, which one is to be connected in a geyser circuit marked 3 kW, 220V? Give reason for your answer.
Advertisements
Solution
The current flowing through Geyser
`= (3 xx 1000)/220 = 13.63` A = 14 A.
The rating of fuse should be just matching with the maximum current carried by the circuit. So the fuse rating should be of 15A.
RELATED QUESTIONS
Define Electric power.
At what frequency is AC supplied to residential houses?
Define watt. Write down an equation linking watts, volts and amperes.
Two lamps are rated 220V, 50W and the other rated 220V, 100W are connected in series with the mains of 220 V. Explain, why the 50W lamp glows more?
How does earthing prevent electrical shock?
With reference to the diagram shown below calculate:
(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.
An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.
What is the commercial unit of electrical energy?
A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.
