Electricity
Rajasthan Board · Class 10 · Science
Flashcards for Electricity — Rajasthan Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allA torch bulb glows when connected to a battery but stops glowing when the switch is turned off. Why does this happen?
Answer
The switch creates or breaks a conducting path between the battery and bulb. When the switch is ON, it completes the electric circuit allowing current to flow through the bulb, making it glow. When OF…
If 300 coulombs of charge flows through a wire in 10 minutes, calculate the electric current.
Answer
Given: Q = 300 C, t = 10 min = 600 s Using formula: I = Q/t I = 300 C ÷ 600 s = 0.5 A Therefore, the electric current is 0.5 amperes. This means 0.5 coulombs of charge flows through the wire every sec…
What is electric current and what causes it to flow?
Answer
Electric current is the flow of electric charges through a conductor. It's measured as the amount of charge flowing through a cross-section per unit time (I = Q/t). Current flows due to potential diff…
How much work is done when 4 coulombs of charge moves across a potential difference of 15 volts?
Answer
Given: Q = 4 C, V = 15 V Using formula: W = VQ W = 15 V × 4 C = 60 J Therefore, 60 joules of work is done. This energy is provided by the battery to move the charges through the circuit against resist…
Why do we measure potential difference in parallel and current in series in electric circuits?
Answer
Voltmeter measures potential difference between two points, so it's connected in parallel to compare the 'electrical pressure' at those points. Ammeter measures current flowing through a component, so…
A wire carrying 2A current has 24V across it. What is its resistance? What happens if voltage doubles?
Answer
Given: I = 2 A, V = 24 V Using Ohm's law: R = V/I = 24V ÷ 2A = 12 Ω If voltage doubles to 48V: I = V/R = 48V ÷ 12Ω = 4 A Resistance remains constant (property of conductor), but current doubles when v…
Why does a thicker wire have less resistance than a thinner wire of the same material and length?
Answer
Resistance is inversely proportional to cross-sectional area (R ∝ 1/A). A thicker wire has larger cross-sectional area, providing more space for electrons to flow. Like a wider road allows more traffi…
A nichrome wire of length 1m and area 0.01 mm² has resistivity 100×10⁻⁶ Ωm. Calculate its resistance.
Answer
Given: l = 1 m, A = 0.01 mm² = 0.01×10⁻⁶ m², ρ = 100×10⁻⁶ Ωm Using formula: R = ρl/A R = (100×10⁻⁶ × 1) ÷ (0.01×10⁻⁶) R = 100×10⁻⁶ ÷ 10⁻⁸ = 10 Ω The nichrome wire has resistance of 10 ohms, suitable f…
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