Why is fuse wire always placed in a live circuit?

The fuse wire is always connected in the live wire of the circuit because if the fuse is put in the neutral wire, then due to excessive flow of current when the fuse burns, current stops flowing in the circuit, but the appliance remains connected to the high potential point of the supply through the live wire.

E M B I B E

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 10

EASY

10th CBSE

IMPORTANT

Earn 100

A wire of uniform area of cross-section is stretched to four times its original length. By what factor does its resistivity change?

Important Questions on Electricity

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 11

If a wire of resistivity

(ρ)

is stretched to thrice its initial length, what will be its new resistivity?

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 1

State Ohm's law. Express it mathematically. Define SI unit of resistance.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 2

A wire is

1.0 m

long,

0.2 mm

diameter has resistance of

10 Ω

. Calculate the resistivity of material.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 3

Calculate the area of cross-section of a wire, if its length is

1.0 m

, its resistance is

23 Ω

and resistivity of the material is

1.84 \times 10^{- 6} Ω m

.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 4

Draw a schematic diagram of an electric circuit consisting of a battery of two cells, each of

1.5 V

,

5 Ω

,

10 Ω

and

15 Ω

resistors and a plug key all connected in series.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 5

What is an electric circuit? Distinguish between an open and closed circuit.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 6

Calculate the resistance of a bulb which allows

10 A

current when connected to a

220 V

power source.

EASY

10th CBSE

IMPORTANT

Core Science Physics>Chapter 3 - Electricity>EXERCISE - 3B>Q 7

In an experiment to study the relation between the potential difference across a resistor and the current through it, a student recorded the following observations:

Potential difference $V (volts)$	$1.0$	$2.2$	$3.0$	$4.0$	$6.4$
Current $I (amperes)$	$0.1$	$0.2$	$0.6$	$0.4$	$0.6$

On examining the above observations the teacher asked the student to reject one set of readings as the values were out of agreement with the rest. Which one of the above sets of readings can be rejected? Calculate the mean value of resistance of the resistor based on the remaining four sets of readings.

Learn and Prepare for any exam you want !

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