What is excitation?

Excitation (magnetic)

An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor. The process of generating a magnetic field by means of an electric current is called excitation.

Battery Powerbank Vivis 5200maH

How much you paid for this stuff? Last week I bought this Vivis powerbank at Lowyat. This powerbank cost me about RM95.

Spec:

• 5200mah high capacity rechargeable li-ion battery
• battery level ondicator
• pocket size
• o/p current 1A
• i/p curren 0.8A
• o/p voltage 5V
• i/p voltage 5V

Why need this power bank? This is because i am a traveller. That powerbank should be enough for me to charge at least 3 times my phone.