Electrical Power and Household Circuits — Flashcards
ICSE · Class 10 · Physics
36 flashcards for Electrical Power and Household Circuits (ICSE Class 10 Physics) to test yourself on key terms and facts.
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See them allState the formula for electrical energy in terms of charge and potential difference.
Answer
Formula: W = QV Meaning: electrical energy W equals charge Q multiplied by potential difference V. Units: W in joule, Q in coulomb, V in volt. Quick example: If Q = 2 C and V = 5 V, then W = 2 × 5 = 1…
State the formula for electrical energy in terms of current, voltage, and time.
Answer
Formula: W = Vit Meaning: electrical energy W equals voltage V × current i × time t. Units: W in joule, V in volt, i in ampere, t in second. Quick example: If V = 220 V, i = 2 A, and t = 10 s, then W …
A current of 3 A flows through a resistor of 4 ohm for 5 s. Find the electrical energy consumed.
Answer
Given: i = 3 A, R = 4 ohm, t = 5 s Formula: W = i^2Rt Step 1: i^2 = 3^2 = 9 A^2 Step 2: W = 9 × 4 × 5 J Step 3: W = 180 J Answer: 180 J…
A voltage of 12 V is applied across a 6 ohm resistor for 10 s. Find the electrical energy consumed.
Answer
Given: V = 12 V, R = 6 ohm, t = 10 s Formula: W = V^2t/R Step 1: V^2 = 12^2 = 144 V^2 Step 2: W = 144 × 10 / 6 J Step 3: W = 1440 / 6 = 240 J Answer: 240 J…
A charge of 10 C moves through a potential difference of 2 V. Find the electrical work done.
Answer
Given: Q = 10 C, V = 2 V Formula: W = QV Step 1: W = 10 × 2 J Step 2: W = 20 J Answer: 20 J…
State the formula for electrical power and its meaning.
Answer
Formula: P = W/t Also: P = Vi, P = V^2/R, P = i^2R Meaning: electrical power is the rate at which electrical energy is used. Units: P in watt, W in joule, t in second, V in volt, i in ampere, R in ohm…
A device works at 220 V and takes 0.5 A current. Find its power.
Answer
Given: V = 220 V, i = 0.5 A Formula: P = Vi Step 1: P = 220 × 0.5 W Step 2: P = 110 W Answer: 110 W…
Why is electrical power important in daily life?
Answer
Electrical power shows how fast an appliance converts electrical energy into other forms. A higher-power appliance uses energy faster. Example: A room heater has higher power than a bulb, so it conver…
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