Efficiency= Useful Energy Out Total Energy In

Specific Heat Capacity (C)

Energy Transferred= Mass x C x Temp change (J) (Kg)(J/Kg°C) (°C)

No. of Units(kWh)= Power x Time (kW) (Hours)

Energy= Power x Time (J) (W/kW) (s)

Speed= frequency x Wavelength (m/s) (Hz) (m)

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Physics5

Question	Answer
Efficiency Equation	Efficiency= Useful Energy Out Total Energy In
Specific Heat Capacity (C)	Energy Transferred= Mass x C x Temp change (J) (Kg)(J/Kg°C) (°C)
Cost of Electricity	No. of Units(kWh)= Power x Time (kW) (Hours)
Payback Time	Initial cost Annual saving
Energy Equation	Energy= Power x Time (J) (W/kW) (s)
Wave Equation	Speed= frequency x Wavelength (m/s) (Hz) (m)