# Class 10 FRANK Solutions Physics Chapter 4.1 - Ohm's Law and Electrical Circuits

Learn better with our Frank Solutions for ICSE Class 10 Physics Chapter 4.1 Ohm’s Law and Electrical Circuits. Revise the differences between a battery and a cell. Use our solutions to understand how to correctly draw a circuit diagram. Our expert solutions will also help you to solve Physics numerical problems such as calculating the potential difference or finding the value of the resistance of a resistor.

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## Ohm's Law and Electrical Circuits Exercise 173

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Correct diagram:

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No, it is not always true. E.g. Diode valve, junction diode etc. do not obey Ohm's law.

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Its SI unit is 'ohm'.

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(i) Nature of conductor: different materials have different concentration of free electrons and therefore resistance of a conductor depends on its material.

(ii) Length of conductor: Resistance of a conductor is directly proportional to the length of a conductor.

(iii) Area of cross-section of a conductor: Resistance of a conductor is inversely proportional to the area of cross-section of the uniform wire.

(iv) Temperature of conductor: In general for metallic conductors, higher the temperature larger is the resistance.

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(ii) Alloys e.g. Constantan

(iii) Semiconductors e.g. Germanium

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## Ohm's Law and Electrical Circuits Exercise 174

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According to Ohm's law, the current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and temperature of conductor remains constant.

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(i) Connecting wires are made of conductors like copper.

(ii) Conductors are used as electrolytes in cells

## Ohm's Law and Electrical Circuits Exercise 175

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(b) Volt

(c) Coulomb

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Its SI unit is newton per coulomb. It is a vector quantity.

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Or, W = 5 x 1 = 5 J

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(ii) potential difference

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(iv) voltmeter

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I = Q/t

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The direction of electronic current is taken as opposite to the direction of motion of electrons.