Scenario 2: Charging A Power Bank

System: Power bank
Initial State: A power bank at 50% of its maximum capacity was connected to the electrical mains.
Final State: The power bank was fully charged and it became warm.
Remarks: Assume no energy was transferred from the power bank to the surroundings by heating.
Initial Amount of Energy of the System
System
Final Amount of Energy of the System
Energy / Units
C
E
G
I
K
N
Energy Transfer In:
Type Of Transfer
Propagation of waves Propagation of waves Propagation of waves Propagation of waves
Heating Heating Heating Heating
Electrically Electrically Electrically Electrically
Electrically Mechanically Electrically Mechanically
------------ ------------

Type Of Transfer
Propagation of waves Propagation of waves Propagation of waves Propagation of waves
Heating Heating Heating Heating
Electrically Electrically Electrically Electrically
Electrically Mechanically Electrically Mechanically
------------ ------------
O
Energy Transfer Out:
Type Of Transfer
Electrically Propagation of waves Electrically Propagation of waves
Electrically Heating Electrically Heating
Electrically Electrically Electrically Electrically
Electrically Mechanically Electrically Mechanically
------------ ------------

Type Of Transfer
Electrically Propagation of waves Electrically Propagation of waves
Electrically Heating Electrically Heating
Electrically Electrically Electrically Electrically
Electrically Mechanically Electrically Mechanically
------------ ------------
Energy / Units
C
E
G
I
K
N
Initial Energy of the System
+
Energy Transferred Into the System
=
Energy Transferred Out of the System
+
Final Energy of the System
Legend:

Electrically

Heating

C - Chemical
E - Elastic
G - Gravitational
I - Internal
K - Kinetic
N - Nuclear

Mechanically

Propagation of waves