What is a voltmeter? How is it connected in a circuit?
(N/A) voltmeter is an electrical instrument used to measure the potential difference between two points in an electrical circuit.
It is always connected in parallel across the component or the part of the circuit where the potential difference is to be measured.
It is always connected in parallel across the component or the part of the circuit where the potential difference is to be measured.
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Why is tungsten metal selected for making filaments of incandescent lamps?
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View SolutionThe electrical resistivity of a few materials is given below in ohm-metre. Which of these materials can be used for making the element of a heating device?
$A$. $6.84 \times 10^{-8} \, \Omega m$ $B$. $1.60 \times 10^{-8} \, \Omega m$ $C$. $1.00 \times 10^{-4} \, \Omega m$ $D$. $2.50 \times 10^{12} \, \Omega m$ $E$. $4.40 \times 10^{-5} \, \Omega m$ $F$. $2.30 \times 10^{17} \, \Omega m$
| $A$. $6.84 \times 10^{-8} \, \Omega m$ |
| $B$. $1.60 \times 10^{-8} \, \Omega m$ |
| $C$. $1.00 \times 10^{-4} \, \Omega m$ |
| $D$. $2.50 \times 10^{12} \, \Omega m$ |
| $E$. $4.40 \times 10^{-5} \, \Omega m$ |
| $F$. $2.30 \times 10^{17} \, \Omega m$ |
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View SolutionIn an electrical circuit,two resistors of $2\,\Omega$ and $4\,\Omega$ respectively are connected in series to a $6\,V$ battery. The heat dissipated by the $4\,\Omega$ resistor in $5\,s$ will be ........ $J$.
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View SolutionTungsten is used almost exclusively for filaments of electric bulbs. List two reasons.
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View SolutionGive an example of a metal which is the best conductor of heat.
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