$(a)$ 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 substance at $20^{\circ} C$ are given below
Silver
$1.60 \times 10^{-8}\, \Omega m$
Copper
$1.62 \times 10^{8} \,\Omega$
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 better conductor ? Why ?
$(ii)$ Which material would you advise to use in electrical heating device ? Why ?
$(a)$ 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 substance at $20^{\circ} C$ are given below
| Silver | $1.60 \times 10^{-8}\, \Omega m$ |
| Copper | $1.62 \times 10^{8} \,\Omega$ |
| 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 better conductor ? Why ?
$(ii)$ Which material would you advise to use in electrical heating device ? Why ?
$(a)$ Potential difference between two points is said to be one volt when one joule of work is done to move a charge of one coulomb from one point to the other.
$(b)$ Heating element glows because its resistivity is much higher than the resisitivity of the connecting cord.
$(c)$ $(i)$ Silver is a better conductor because it has the less resistivity.
$(ii)$ Nichrome, because its resistivity is much higher in comparison to the others.
Similar Questions
$(a)$ State $Ohm's$ law. Express it mathematically.
$(b)$ Write symbols used in electric circuits to represent
$(i)$ variable resistance.
$(ii)$ voltmeter.
$(c)$ An electric bulb is rated $220, V$ and $100\, W$ When it is operated on $110\, V ,$ what will be the power consumed ?
$(a)$ State $Ohm's$ law. Express it mathematically.
$(b)$ Write symbols used in electric circuits to represent
$(i)$ variable resistance.
$(ii)$ voltmeter.
$(c)$ An electric bulb is rated $220, V$ and $100\, W$ When it is operated on $110\, V ,$ what will be the power consumed ?
The equivalent resistance between points $A$ and $B$ in the following electric circuit is $.....$
The equivalent resistance between points $A$ and $B$ in the following electric circuit is $.....$
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
In the figure given below, $A, B$. and $C$ are three ammeters. The ammeter $B$ reads $0.5\, A .$ (All the ammeters have negligible resistance.) Calculate
$(i)$ the readings in the ammeters $A$ and $C$. $(ii)$ the total resistance of the circuit.
In the figure given below, $A, B$. and $C$ are three ammeters. The ammeter $B$ reads $0.5\, A .$ (All the ammeters have negligible resistance.) Calculate
$(i)$ the readings in the ammeters $A$ and $C$. $(ii)$ the total resistance of the circuit.
$(a)$ $(i)$ What is meant by saying that the potential difference between two points is $1$ volt ?
$(ii)$ How much energy is given to $5$ coulomb of charge passing through a $12 \,V$ battery ?
$(b)$ Describe an activity with necessary electric circuit drawn to study the factors on which the resistance of a conducting wire depends.
$(a)$ $(i)$ What is meant by saying that the potential difference between two points is $1$ volt ?
$(ii)$ How much energy is given to $5$ coulomb of charge passing through a $12 \,V$ battery ?
$(b)$ Describe an activity with necessary electric circuit drawn to study the factors on which the resistance of a conducting wire depends.