Changes in Energy (AQA GCSE Physics): Flashcards

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Changes in Energy
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Definition of specific heat capacity

Energy needed to raise the temperature of 1 kg of material by 1°C

Units of specific heat capacity

J/kg°C

Symbol for specific heat capacity

cc

High specific heat capacity materials need ___ thermal energy

More

Low specific heat capacity materials need ___ thermal energy

Less

Formula for change in thermal energy

ΔE=m×c×ΔθΔE = m × c × Δθ

ΔEΔE in the heat change formula

Change in thermal energy (J)

mm in the heat change formula

Mass (kg)

cc in the heat change formula

Specific heat capacity (J/kg°C)

ΔθΔθ in the heat change formula

Change in temperature (°C or K)

Formula for power in practical

P=V×IP = V × I

Formula for energy transferred

E=P×tE = P × t

Rearranged formula to find cc

c=ΔEm×Δθc = \frac{ΔE}{m × Δθ}

Specific heat capacity of water (J/kg°C)

4,200 J/kg°C

Why water is used in cooling systems

High specific heat capacity - absorbs lots of heat without large temperature increase

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