Electric Energy: Consumption and Conservation — Flashcards
Kerala Board · Class 10 · Physics
22 flashcards for Electric Energy: Consumption and Conservation (Kerala Board Class 10 Physics) to test yourself on key terms and facts.
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What is the heating effect of electric current? Give examples of appliances that use this effect.
Answer
The heating effect of electric current is the conversion of electric energy mainly into heat energy when current flows through a conductor. This process is called Joule heating or Ohmic heating. Examp…
Why is nichrome used as a heating element? List its properties.
Answer
Nichrome is used because it has: (1) High oxidation resistance - resists corrosion at high temperatures, (2) Ability to provide heat energy for long time in red hot state, (3) High resistivity - even …
Define resistivity and write its formula relating to resistance.
Answer
Resistivity (ρ) is the resistance of a conductor with cross-sectional area of 1 m² and length of 1 m. It is an intrinsic property of materials. Formula: R = ρℓ/A, where R = resistance, ρ = resistivity…
State Joule's law and write its mathematical expression.
Answer
Joule's law states: The quantity of heat produced in a current-carrying conductor is directly proportional to the square of current (I²), resistance (R), and time (t). Mathematical expression: H = I²R…
Derive the alternative forms of Joule's law equation using Ohm's law.
Answer
Starting with H = I²Rt and using Ohm's law V = IR: 1) I = V/R, so H = (V/R)² × R × t = V²t/R 2) R = V/I, so H = I² × (V/I) × t = VIt Therefore: H = I²Rt = V²t/R = VIt…
Calculate heat produced when 0.5 A current flows through 100 Ω resistance for 5 minutes.
Answer
Given: I = 0.5 A, R = 100 Ω, t = 5 min = 5 × 60 = 300 s Using H = I²Rt H = (0.5)² × 100 × 300 H = 0.25 × 100 × 300 = 7500 J Therefore, heat produced = 7500 J or 7.5 kJ…
What factors influence the quantity of heat produced in a current-carrying conductor?
Answer
Three factors influence heat production: (1) Current (I) - heat ∝ I², (2) Resistance (R) - heat ∝ R, (3) Time (t) - heat ∝ t. When current increases, heat increases as square of current. Higher resist…
Define electric power and write its three mathematical expressions.
Answer
Electric power is the rate of work done by an electrical appliance per unit time, or rate of energy conversion. Unit: watt (W). Three expressions: P = I²R, P = V²/R, P = VI, where P = power, I = curre…
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
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