$(a)$ Explain why a conductor offers resistance to the flow of current.
$(b)$ Differentiate between conductor,resistor,and resistance.
$(b)$ Differentiate between conductor,resistor,and resistance.
(N/A) The flow of electric current in a conductor is due to the motion of electrons. These electrons are not completely free to move; they collide with the atoms and ions of the conductor as they drift. These collisions and the electrostatic attraction exerted by the atoms hinder the motion of electrons,which manifests as resistance.
$(b)$ Conductor: $A$ material that allows electric current to flow through it easily due to the presence of free electrons.
Resistor: $A$ component or conductor that has a specific,significant amount of resistance,used to control or limit the flow of current in a circuit.
Resistance: It is the inherent property of a material by virtue of which it opposes the flow of electric current through it.
$(b)$ Conductor: $A$ material that allows electric current to flow through it easily due to the presence of free electrons.
Resistor: $A$ component or conductor that has a specific,significant amount of resistance,used to control or limit the flow of current in a circuit.
Resistance: It is the inherent property of a material by virtue of which it opposes the flow of electric current through it.
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Similar Questions
$(a)$ What is meant by saying that the potential difference between two points is $1$ volt?
$(b)$ Why does the connecting cord of an electrical heater not glow while the heating element does?
$(c)$ Electrical resistivities of some substances at $20^{\circ}C$ are given below:
Silver $1.60 \times 10^{-8} \, \Omega m$ Copper $1.62 \times 10^{-8} \, \Omega m$ Tungsten $5.2 \times 10^{-8} \, \Omega m$ Iron $10.0 \times 10^{-8} \, \Omega m$ Mercury $94.0 \times 10^{-8} \, \Omega m$ Nichrome $100 \times 10^{-6} \, \Omega m$
Answer the following questions in relation to them:
$(i)$ Among silver and copper, which one is a better conductor? Why?
$(ii)$ Which material would you advise to use in electrical heating devices? Why?
$(b)$ Why does the connecting cord of an electrical heater not glow while the heating element does?
$(c)$ Electrical resistivities of some substances at $20^{\circ}C$ are given below:
| Silver | $1.60 \times 10^{-8} \, \Omega m$ |
| Copper | $1.62 \times 10^{-8} \, \Omega m$ |
| Tungsten | $5.2 \times 10^{-8} \, \Omega m$ |
| Iron | $10.0 \times 10^{-8} \, \Omega m$ |
| Mercury | $94.0 \times 10^{-8} \, \Omega m$ |
| Nichrome | $100 \times 10^{-6} \, \Omega m$ |
Answer the following questions in relation to them:
$(i)$ Among silver and copper, which one is a better conductor? Why?
$(ii)$ Which material would you advise to use in electrical heating devices? Why?
Medium
View SolutionYou are given three bulbs of $25 \, W$,$40 \, W$,and $60 \, W$ marked at $220 \, V$. Which one of them has the lowest resistance?
Easy
View Solution$(a)$ State the commercial unit of electric energy and find its relation with its $SI$ unit.
$(b)$ The current through a resistor is made three times its initial value. Calculate how it will affect the heat produced in the resistor.
$(c)$ Find the increase in the amount of heat generated in a conductor if another conductor of double resistance is connected in the circuit,keeping all other factors unchanged.
$(b)$ The current through a resistor is made three times its initial value. Calculate how it will affect the heat produced in the resistor.
$(c)$ Find the increase in the amount of heat generated in a conductor if another conductor of double resistance is connected in the circuit,keeping all other factors unchanged.
Medium
View SolutionWhich of the following substances does not contain free electrons?
Easy
View Solution$(a)$ Define the term 'volt'.
$(b)$ State the relation between work,charge,and potential difference for an electric circuit. Calculate the potential difference between the two terminals of a battery,if $100 \ J$ of work is required to transfer $20 \ C$ of charge from one terminal of the battery to the other.
$(b)$ State the relation between work,charge,and potential difference for an electric circuit. Calculate the potential difference between the two terminals of a battery,if $100 \ J$ of work is required to transfer $20 \ C$ of charge from one terminal of the battery to the other.
Medium
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