sci_phy

Power

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

Two appliances can do the same job; the higher-power one does it faster. Unit: watt (W) = 1 joule per second.

P = Fv comes from P = E/t. A 2000 N thrust at 30 m/s gives 60 000 W = 60 kW.

Using Ohm's law (V = IR) it can also be written P = I²R or P = V²/R, whichever fits the data.

A 2 kW heater uses energy four times faster than a 0.5 kW bulb. Energy used = power × time.

power	the rate at which energy is transferred or work is done, measured in watts
watt (W)	the SI unit of power; 1 watt = 1 joule transferred per second
kilowatt (kW)	a unit of power equal to 1000 watts
energy	the capacity to do work, measured in joules
work done	energy transferred when a force moves through a distance
power rating	the value on an appliance showing how fast it transfers energy in normal use
efficiency	useful energy (or power) out divided by total energy (or power) in
thrust	the forward driving force produced by an engine

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