How would the reading of voltmeter $(V)$ change, if it is connected between $B$ and $C$ ? Justify your answer.
How would the reading of voltmeter $(V)$ change, if it is connected between $B$ and $C$ ? Justify your answer.
$R = R _{1}+ R _{2}+ R _{3}=1+2+3=6 \Omega$
$V = IR$
$I =\frac{ V }{ R }=\frac{3}{6}=\frac{1}{2} A$
Voltage across $1 \Omega, V = IR =\frac{1}{2} \times 1=0.5 V$
Voltage across $3 \Omega, V = IR =\frac{1}{2} \times 3=1.5 V$
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$(a)$ 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
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Copper
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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 ?