Class 10 Science Electricity Mix Examples - Electricity

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Why should the melting point of a fuse wire be low?

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(N/A) fuse wire is designed to protect electrical appliances from damage caused by excessive current. When the current flowing through the circuit exceeds the safe limit,the heat generated $(H = I^2Rt)$ increases significantly. Because the fuse wire has a low melting point,it melts quickly when this excess heat is produced,thereby breaking the circuit and preventing further flow of current. This action protects the connected devices from potential damage or fire hazards.

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Mix Examples - Electricity

Two conductors,one having resistance $R$ and another $2R$ are connected in turn across a $dc$ source. If the rate of heat produced in the two conductors is $Q_{1}$ and $Q_{2}$ respectively,what is the value of $Q_{1} / Q_{2}$?

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$A$ $4 \, \Omega$ resistance wire is doubled on itself. Calculate the new resistance of the wire.

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If $4.8 \text{ A}$ current is passed through an electrical appliance,then the number of electrons passing through it in $1 \text{ second}$ will be $......$

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$(a)$ Why are copper or aluminium wires generally used for electrical transmission and distribution purposes?
$(b)$ Two wires,one of copper and the other of manganin,have equal lengths and equal resistances. Which wire is thicker? Given that the resistivity of copper is lower than that of manganin.

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$A$ student carries out an experiment and plots the $V-I$ graph of three samples of nichrome wire with resistances $R_1, R_2$ and $R_3$ respectively (Figure). Which of the following is true?

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Why should the melting point of a fuse wire be low?

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Two conductors,one having resistance $R$ and another $2R$ are connected in turn across a $dc$ source. If the rate of heat produced in the two conductors is $Q_{1}$ and $Q_{2}$ respectively,what is the value of $Q_{1} / Q_{2}$?

$A$ $4 \, \Omega$ resistance wire is doubled on itself. Calculate the new resistance of the wire.

If $4.8 \text{ A}$ current is passed through an electrical appliance,then the number of electrons passing through it in $1 \text{ second}$ will be $......$

$(a)$ Why are copper or aluminium wires generally used for electrical transmission and distribution purposes?$(b)$ Two wires,one of copper and the other of manganin,have equal lengths and equal resistances. Which wire is thicker? Given that the resistivity of copper is lower than that of manganin.

$A$ student carries out an experiment and plots the $V-I$ graph of three samples of nichrome wire with resistances $R_1, R_2$ and $R_3$ respectively (Figure). Which of the following is true?

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$(a)$ Why are copper or aluminium wires generally used for electrical transmission and distribution purposes?
$(b)$ Two wires,one of copper and the other of manganin,have equal lengths and equal resistances. Which wire is thicker? Given that the resistivity of copper is lower than that of manganin.