The energy of a phone battery is about 12.9 times the energy of a food kilocalorie. Selected basis: approximate values.
ENERGY STORED OR TRANSFERRED
Bar length represents energy. Equal energy does not imply the same temperature, power or usefulness.
4.184 kJ - Energy; defined energy model.
A food kilocalorie is the energy needed to raise the temperature of one kilogram of water by one degree Celsius, used to express food energy.
One thermochemical kilocalorie, the unit commonly written Calorie on food labels.
Defined examples — our methodology54 kJ - Energy; defined energy model.
A phone battery stores electrical energy to power a mobile phone.
A defined 15 Wh stored-energy battery. Actual devices and usable energy vary.
Defined examples — our methodology
There’s always another scale
EnergyFood kilocalorie4.184 kJA food kilocalorie is the energy needed to raise the temperature of one kilogram of water by one degree Celsius, used to express food energy.
EnergyPhone battery54 kJA phone battery stores electrical energy to power a mobile phone.
EnergyElectric car battery216 MJAn electric car battery stores energy to power an electric vehicle.
EnergyOne second of sunlight3.828 × 10¹¹ PJThe total energy emitted by the Sun in all directions over one second.Side by side
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scaleGot a good eye for scale?