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.
Resistivity of tungsten is very high as it is an alloy. It does not oxidise readily at very high temperature.
Similar Questions
An electric lamp is marked $100 \,W , 220\, V$. It is used for $5$ hours daily. Calculate : $(i)$ its resistance while glowing. $(ii)$ energy consumed in $kWh$ per day.
An electric lamp is marked $100 \,W , 220\, V$. It is used for $5$ hours daily. Calculate : $(i)$ its resistance while glowing. $(ii)$ energy consumed in $kWh$ per day.
$(a)$ What do the following symbols represent in a circuit ? Write the name and one function of each.
$(b)$ Draw a schematic diagram of a circuit consisting of a battery of $12 V$, three resistors of $5\, \Omega, 10\, \Omega$ and $20\, \Omega$ connected in parallel, an ammeter to measure the total current through the circuit, $a$ voltmeter to measure the potential difference across the combination of resistors.
$(c)$ State any one advantage of connecting electrical devices in parallel with the mains instead of connecting them in series in a household circuit.
$(a)$ What do the following symbols represent in a circuit ? Write the name and one function of each.
$(b)$ Draw a schematic diagram of a circuit consisting of a battery of $12 V$, three resistors of $5\, \Omega, 10\, \Omega$ and $20\, \Omega$ connected in parallel, an ammeter to measure the total current through the circuit, $a$ voltmeter to measure the potential difference across the combination of resistors.
$(c)$ State any one advantage of connecting electrical devices in parallel with the mains instead of connecting them in series in a household circuit.
Calculate the number of electrons that would flow per second through the cross$-$section of a wire when $1 \,A$ current flows in it.
Calculate the number of electrons that would flow per second through the cross$-$section of a wire when $1 \,A$ current flows in it.
An electric bulb is connected to a $220\, V$ generator. The current is $0.50 A$. What is the power of the bulb ?
An electric bulb is connected to a $220\, V$ generator. The current is $0.50 A$. What is the power of the bulb ?
Heat dissipated by a conductor when a current is passed through it is directly proportional to the resistance of the conductor.
Heat dissipated by a conductor when a current is passed through it is directly proportional to the resistance of the conductor.