Question

Assertion: A fuse wire is always connected in parallel with the mainline.
Reason: If a current larger than the specified value flows through the circuit, fuse wire
melts.

Answer 1

Answer:

Fuse wire is always connected in series.

Explanation:

Assertion: A fuse wire is always connected in SERIES with the mainline.

Reason: If a current larger than the specified value flows through the circuit, fuse wire

melts AND OPENS THE CIRCUIT SO THAT CURRENT CAN NOT PASS THROUGH CIRCUIT ANYMORE.

Answer 2

Fuse wire must always be connected in series to serve its purpose.

Assertion is false but the reason is true.

Explanation:

• Fuse wire is always connected in series to prevent the electrical appliances from damage due to unwanted high current in the circuit.

• Fuse wire heats up-to the melting point and melts down to break the circuit. This change occurs within a fraction of second for the fuse wire so as to prevent the appliances from damaging.

This is the reason why fuse wires are made thin so that they can melt easily by the heat of current given the the Joules Law of heating.

Mathematically:

$Q=i^2.R.t$

where

i = current in the wire

R = resistance of the wire

t = time for which the current flows

• Also for the resistance of the wire we have the following parameters affecting concern, expressed in the below mentioned mathematical expression.

$R=\rho.\frac{l}{a}$

where:

$\rho=$ specific resistance of the material

$l=$ length of the wire

$a=$ area of the wire

So, from the above relation we can conclude that the fuse wire must be long and thin of high resistivity.

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TOPIC: fuse, resistance

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