The following table gives the resistivity of three samples: Sample Resistivity A 1 . 6 × 10 - 8 Ω m B 5 . 1 × 10 - 8 Ω m C 10 . 6 × 10 - 6 Ω m Which of them is suitable for heating elements of electrical appliances and why?

Sample C because it has the highest resistivity in the given range of resistors. Note: Sample C has highest resistivity and consequently highest resistance. Therefore, it will resist the flow of charges more, and lead to development of heat faster.

Following table gives the resistivity of three samples in Ω m Sample Resistivity A 1 . 6 × 10 - 8 B 7 . 5 × 10 - 7 C 44 × 10 - 6 Which of them is a good conductor? And which of them is an insulator? And why?

A is a good conductor with least resistivity. C is an insulator with maximum resistivity. Note: C has highest resistivity when compared to other samples. Since, resistivity is high, resistance of Sample C is high and hence it can be considered as an insulator.

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The voltage-current ( $V$ - $I$ ) graph of a metallic conductor at two different temperature $T_{1}$ and $T_{2}$ is shown in figure. At which temperature is the resistance higher?

Important Questions on Electricity

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 23

The following table gives the resistivity of three samples:

Sample	Resistivity
$A$	$1.6 \times 10^{- 8} Ω m$
$B$	$5.1 \times 10^{- 8} Ω m$
$C$	$10.6 \times 10^{- 6} Ω m$

Which of them is suitable for heating elements of electrical appliances and why?

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 24

Following table gives the resistivity of three samples in $(Ω m)$

Sample	Resistivity
$A$	$1.6 \times 10^{- 8}$
$B$	$7.5 \times 10^{- 7}$
$C$	$44 \times 10^{- 6}$

Which of them is a good conductor? And which of them is an insulator? And why?

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 25

The electrical resistivity of few materials is given below in ohm-meter. Which of these materials can be used for making element of a heating device?

Material	Resistivity (in ohm-metre)
A	$6.84 \times 10^{- 8}$
B	$1.60 \times 10^{- 8}$
C	$2.30 \times 10^{17}$
D	$1.00 \times 10^{- 6}$
E	$2.50 \times 10^{12}$
F	$4.40 \times 10^{- 8}$

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 26

How much current will an electric bulb draw from a

220 V

source if the resistance of the bulb is

1200 Ω ?

If in place of bulb, a heater of resistance

100 Ω

is connected to the sources. Calculate the current drawn by it.

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 27

Graphs between electric current and potential difference across two conductors $A$ and $B$ are plotted as shown in figure. Which of the two conductors has more resistance?

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 28

What is likely to happen and how it would affect the value of resistance if we pass the current for a longer time?

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 29

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

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ESSENTIALS OF PHYSICS CLASS X>Chapter 3 - Electricity>Assignment-3>Q 30

In an electric circuit with a resistance wire and a cell, the current flowing is

I .

What would happen to this current if the wire is replaced by another thicker wire of same material and same length? Give reason.

The voltage-current (V-I) graph of a metallic conductor at two different temperature T1 and T2 is shown in figure. At which temperature is the resistance higher?

Important Questions on Electricity

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The voltage-current ( $V$ - $I$ ) graph of a metallic conductor at two different temperature $T_{1}$ and $T_{2}$ is shown in figure. At which temperature is the resistance higher?