Advertisements
Advertisements
Questions
What is the purpose of a fuse in an electrical circuit?
Describe the use of a fuse in an electric circuit.
Advertisements
Solution 1
An electric fuse is a device which is used to Ii m it the current in an electric circuit. The use of a fuse thus safeguards the circuit and appliances connected in that circuit from being damaged. It is a short piece of wire made of an alloy of lead and tin. If the current passing through the fuse exceeds the safeguard Ii m it the heat produced melts the fuse and this breaks the circuit.
Solution 2
Fuse is a safety device which is used to limit the current in an electric circuit.
RELATED QUESTIONS
Which instrument is used to measure electric current? How should it be connected in a circuit?
A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig. The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :
The total current taken from the supply
What determines the direction of flow of electrons between two charged conductors kept in contact?
Give the electric current unit.
The SI unit for electric current is the coulomb.
