Why do the wires connecting an electric heater to the mains not glow while its heating element does ?
Why do the wires connecting an electric heater to the mains not glow while its heating element does ?
The wires of the connecting cord of electric heater are made of Cu$-$negligible heat is produced in it due to its extremely low resistance. The heating element of an electric heater made of nichrome wire. It glows because large amount of heat is produced due to its high resistance.
Similar Questions
Tungsten is used almost exclusively for filaments of electric bulb. List two reasons.
Tungsten is used almost exclusively for filaments of electric bulb. List two reasons.
The table given below gives the resistivity of three samples in ohm metre
Samples
$A$
$B$
$C$
Resistivity
$1.6 \times 10^{-8}$
$7.5 \times 10^{17}$
$44 \times 10^{-6}$
$(a)$ Which of them is a good conductor ? Which is an insulator ? Why?
$(b)$ $A$ wire of resistance $4$ ohm is doubled on it. Calculate the new resistane of the wire.
The table given below gives the resistivity of three samples in ohm metre
| Samples | $A$ | $B$ | $C$ |
| Resistivity | $1.6 \times 10^{-8}$ | $7.5 \times 10^{17}$ | $44 \times 10^{-6}$ |
$(a)$ Which of them is a good conductor ? Which is an insulator ? Why?
$(b)$ $A$ wire of resistance $4$ ohm is doubled on it. Calculate the new resistane of the wire.
$1\, kW h =3.6 \times 10^{6}$ joule.
$1\, kW h =3.6 \times 10^{6}$ joule.
How is voltmeter connected in a circuit ?
How is voltmeter connected in a circuit ?
A piece of wire of resistance $6\, \Omega$ is connected to $a$ battery of $12 \,V$. Find the amount of current flowing through it. Now, the same wire is redrawn by stretching it to double its length. Find the resistance of the new (redrawn) wire.
A piece of wire of resistance $6\, \Omega$ is connected to $a$ battery of $12 \,V$. Find the amount of current flowing through it. Now, the same wire is redrawn by stretching it to double its length. Find the resistance of the new (redrawn) wire.