An electric iron of resistance $20\, \Omega$ takes a current of $5\, A$. Calculate the heat developed in $30\, s$.
- A$6 \times 10^4\, J$
- B$3 \times 10^4\, J$
- C$4.5 \times 10^4\, J$
- D$1.5 \times 10^4\, J$
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Use the data in the table to answer the following: Which among iron and mercury is a better conductor?
< p style="text-align:center"> < span style="font-size:14px"> Electrical resistivity of some substances at $20\,^oC$
Material Resistivity $(\Omega \,m)$ Iron $10.0 \times 10^{-8}$ Mercury $94.0 \times 10^{-8}$
< p style="text-align:center"> < span style="font-size:14px"> Electrical resistivity of some substances at $20\,^oC$
| Material | Resistivity $(\Omega \,m)$ |
| Iron | $10.0 \times 10^{-8}$ |
| Mercury | $94.0 \times 10^{-8}$ |
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View SolutionExplain the following.
$(a)$ Why is tungsten used almost exclusively for the filament of electric lamps?
$(b)$ Why are the conductors of electric heating devices,such as bread-toasters and electric irons,made of an alloy rather than a pure metal?
$(a)$ Why is tungsten used almost exclusively for the filament of electric lamps?
$(b)$ Why are the conductors of electric heating devices,such as bread-toasters and electric irons,made of an alloy rather than a pure metal?
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