Science
(i) State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.
(ii) List the factors on which the resistance of a conductor depends.
Current Electricity
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Answer
(i) Joules law of heating states that the heat dissipated across a resistor is directly proportional to
- the square of the current flowing through it
- resistance of the conductor
- duration of flow of current
i.e., H = I2Rt
(ii) Resistance of conductor depends on —
- length of the conductor — the resistance of a conductor is directly proportional to the length of the conductor.
R ∝ l - area of cross section — the resistance of a conductor is inversely proportional to it's area of cross section (a) normal to the direction of flow of current.
R ∝ - temperature of the conductor — the resistance of conductor increases with an increase in it's temperature.
- nature of material.
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