- Introduction
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- Electric Charges
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- Conductors and insulators
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- Electric potential and potential difference
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- Electric current and electrical circuits
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- Circuit Diagrams
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- Ohm's Law
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- Factors affecting of resistances of a conductor
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- Resistance of a system of resistors
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- Heating Effect of current
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- Applications of heating effect of current
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- Electric Power

- Electric Charge
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- Electric Potential
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- Materials(conductors, insulators & superconductors)
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- Electric Current
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- Ohm's Law

**Question 1. **What happens to resistance when length of conductor is doubled without affecting the thickness of conductor?

**Question 2.** What is the lowest resistance that can be obtained by combining four coils of resistors of 4 Ω, 8 Ω, 12 Ω and 24 Ω?

**Question 3.** What is an ammeter?

**Question 4. **Calculate the number of electrons constituting one coulomb of charge.

**Question 5.** A voltmeter is to be connected in the circuit to measure potential difference across a conductor. Mention the type of combination in which it should be conducted with the conductor.

**Question 6.** A bulb cannot be used in place of a resistor to verify Ohm’s law. Justify this statement with reason.

**Question 7. **What is meant by electric resistance of a conductor?

**Question 8.** Define resistance of a conductor.

**Question 9.** Write SI unit of resistivity.

**Question 10.** How does the resistivity of alloys compare with those of pure metals form which they may have formed?

**Question 11.** Mention any two factors on which the resistance of a cylindrical conductor depends.

(i) resistance change, and

(ii) resistivity change.

(b) Name the characteristics which make it suitable for this.

(a) Its resistance while glowing. (b) Energy consumed in kW h/day.

Answer 2. R= 2Ω

Answer 4. $n = 6.2 \times {10^{18}}$ electrons

Answer 13. 100 J

Answer 14. 4800 Ω

Answer 19. (a) 484 Ω (b) 0.5 kW h

Class 10 Maths Class 10 Science